diff --git a/dom/media/MediaManager.h b/dom/media/MediaManager.h
index b82c2cda775..74bbe06fe05 100644
--- a/dom/media/MediaManager.h
+++ b/dom/media/MediaManager.h
@@ -89,8 +89,6 @@ public:
     mStream = aStream;
     mAudioSource = aAudioSource;
     mVideoSource = aVideoSource;
-    mLastEndTimeAudio = 0;
-    mLastEndTimeVideo = 0;
 
     mStream->AddListener(this);
   }
@@ -187,10 +185,10 @@ public:
     // Currently audio sources ignore NotifyPull, but they could
     // watch it especially for fake audio.
     if (mAudioSource) {
-      mAudioSource->NotifyPull(aGraph, mStream, kAudioTrack, aDesiredTime, mLastEndTimeAudio);
+      mAudioSource->NotifyPull(aGraph, mStream, kAudioTrack, aDesiredTime);
     }
     if (mVideoSource) {
-      mVideoSource->NotifyPull(aGraph, mStream, kVideoTrack, aDesiredTime, mLastEndTimeVideo);
+      mVideoSource->NotifyPull(aGraph, mStream, kVideoTrack, aDesiredTime);
     }
   }
 
@@ -239,8 +237,6 @@ private:
   nsRefPtr<MediaEngineSource> mAudioSource; // threadsafe refcnt
   nsRefPtr<MediaEngineSource> mVideoSource; // threadsafe refcnt
   nsRefPtr<SourceMediaStream> mStream; // threadsafe refcnt
-  StreamTime mLastEndTimeAudio;
-  StreamTime mLastEndTimeVideo;
   bool mFinished;
 
   // Accessed from MainThread and MSG thread
diff --git a/dom/media/webrtc/MediaEngine.h b/dom/media/webrtc/MediaEngine.h
index cb62def6aad..b7c33405b9c 100644
--- a/dom/media/webrtc/MediaEngine.h
+++ b/dom/media/webrtc/MediaEngine.h
@@ -110,8 +110,7 @@ public:
   virtual void NotifyPull(MediaStreamGraph* aGraph,
                           SourceMediaStream *aSource,
                           TrackID aId,
-                          StreamTime aDesiredTime,
-                          StreamTime &aLastEndTime) = 0;
+                          StreamTime aDesiredTime) = 0;
 
   /* Stop the device and release the corresponding MediaStream */
   virtual nsresult Stop(SourceMediaStream *aSource, TrackID aID) = 0;
diff --git a/dom/media/webrtc/MediaEngineDefault.cpp b/dom/media/webrtc/MediaEngineDefault.cpp
index b0025a82ab8..bb0015da25b 100644
--- a/dom/media/webrtc/MediaEngineDefault.cpp
+++ b/dom/media/webrtc/MediaEngineDefault.cpp
@@ -244,8 +244,7 @@ void
 MediaEngineDefaultVideoSource::NotifyPull(MediaStreamGraph* aGraph,
                                           SourceMediaStream *aSource,
                                           TrackID aID,
-                                          StreamTime aDesiredTime,
-                                          StreamTime &aLastEndTime)
+                                          StreamTime aDesiredTime)
 {
   // AddTrack takes ownership of segment
   VideoSegment segment;
@@ -264,9 +263,7 @@ MediaEngineDefaultVideoSource::NotifyPull(MediaStreamGraph* aGraph,
     segment.AppendFrame(image.forget(), delta, size);
     // This can fail if either a) we haven't added the track yet, or b)
     // we've removed or finished the track.
-    if (aSource->AppendToTrack(aID, &segment)) {
-      aLastEndTime = aDesiredTime;
-    }
+    aSource->AppendToTrack(aID, &segment);
     // Generate null data for fake tracks.
     if (mHasFakeTracks) {
       for (int i = 0; i < kFakeVideoTrackCount; ++i) {
diff --git a/dom/media/webrtc/MediaEngineDefault.h b/dom/media/webrtc/MediaEngineDefault.h
index e64863855f6..efb6b05eb78 100644
--- a/dom/media/webrtc/MediaEngineDefault.h
+++ b/dom/media/webrtc/MediaEngineDefault.h
@@ -53,8 +53,7 @@ public:
   virtual void NotifyPull(MediaStreamGraph* aGraph,
                           SourceMediaStream *aSource,
                           TrackID aId,
-                          StreamTime aDesiredTime,
-                          StreamTime &aLastEndTime);
+                          StreamTime aDesiredTime) MOZ_OVERRIDE;
   virtual bool SatisfiesConstraintSets(
       const nsTArray<const dom::MediaTrackConstraintSet*>& aConstraintSets)
   {
@@ -122,8 +121,7 @@ public:
   virtual void NotifyPull(MediaStreamGraph* aGraph,
                           SourceMediaStream *aSource,
                           TrackID aId,
-                          StreamTime aDesiredTime,
-                          StreamTime &aLastEndTime) {}
+                          StreamTime aDesiredTime) MOZ_OVERRIDE {}
 
   virtual bool IsFake() {
     return true;
diff --git a/dom/media/webrtc/MediaEngineGonkVideoSource.cpp b/dom/media/webrtc/MediaEngineGonkVideoSource.cpp
index be01b334396..b204f19858f 100644
--- a/dom/media/webrtc/MediaEngineGonkVideoSource.cpp
+++ b/dom/media/webrtc/MediaEngineGonkVideoSource.cpp
@@ -70,8 +70,7 @@ void
 MediaEngineGonkVideoSource::NotifyPull(MediaStreamGraph* aGraph,
                                        SourceMediaStream* aSource,
                                        TrackID aID,
-                                       StreamTime aDesiredTime,
-                                       StreamTime& aLastEndTime)
+                                       StreamTime aDesiredTime)
 {
   VideoSegment segment;
 
diff --git a/dom/media/webrtc/MediaEngineGonkVideoSource.h b/dom/media/webrtc/MediaEngineGonkVideoSource.h
index 2d361705b8d..c03a9d4a049 100644
--- a/dom/media/webrtc/MediaEngineGonkVideoSource.h
+++ b/dom/media/webrtc/MediaEngineGonkVideoSource.h
@@ -68,8 +68,7 @@ public:
   virtual void NotifyPull(MediaStreamGraph* aGraph,
                           SourceMediaStream* aSource,
                           TrackID aId,
-                          StreamTime aDesiredTime,
-                          StreamTime &aLastEndTime) MOZ_OVERRIDE;
+                          StreamTime aDesiredTime) MOZ_OVERRIDE;
   virtual bool SatisfiesConstraintSets(
       const nsTArray<const dom::MediaTrackConstraintSet*>& aConstraintSets)
   {
diff --git a/dom/media/webrtc/MediaEngineTabVideoSource.cpp b/dom/media/webrtc/MediaEngineTabVideoSource.cpp
index 2519a12fda7..32fb303df0d 100644
--- a/dom/media/webrtc/MediaEngineTabVideoSource.cpp
+++ b/dom/media/webrtc/MediaEngineTabVideoSource.cpp
@@ -192,8 +192,7 @@ MediaEngineTabVideoSource::Start(SourceMediaStream* aStream, TrackID aID)
 void
 MediaEngineTabVideoSource::NotifyPull(MediaStreamGraph*,
                                       SourceMediaStream* aSource,
-                                      TrackID aID, StreamTime aDesiredTime,
-                                      StreamTime& aLastEndTime)
+                                      TrackID aID, StreamTime aDesiredTime)
 {
   VideoSegment segment;
   MonitorAutoLock mon(mMonitor);
@@ -207,9 +206,7 @@ MediaEngineTabVideoSource::NotifyPull(MediaStreamGraph*,
     segment.AppendFrame(image.forget().downcast<layers::Image>(), delta, size);
     // This can fail if either a) we haven't added the track yet, or b)
     // we've removed or finished the track.
-    if (aSource->AppendToTrack(aID, &(segment))) {
-      aLastEndTime = aDesiredTime;
-    }
+    aSource->AppendToTrack(aID, &(segment));
   }
 }
 
diff --git a/dom/media/webrtc/MediaEngineTabVideoSource.h b/dom/media/webrtc/MediaEngineTabVideoSource.h
index 6820788663f..ae4b3abb979 100644
--- a/dom/media/webrtc/MediaEngineTabVideoSource.h
+++ b/dom/media/webrtc/MediaEngineTabVideoSource.h
@@ -25,7 +25,7 @@ class MediaEngineTabVideoSource : public MediaEngineVideoSource, nsIDOMEventList
     virtual nsresult Deallocate();
     virtual nsresult Start(mozilla::SourceMediaStream*, mozilla::TrackID);
     virtual void SetDirectListeners(bool aHasDirectListeners) {};
-    virtual void NotifyPull(mozilla::MediaStreamGraph*, mozilla::SourceMediaStream*, mozilla::TrackID, mozilla::StreamTime, mozilla::StreamTime&);
+    virtual void NotifyPull(mozilla::MediaStreamGraph*, mozilla::SourceMediaStream*, mozilla::TrackID, mozilla::StreamTime) MOZ_OVERRIDE;
     virtual nsresult Stop(mozilla::SourceMediaStream*, mozilla::TrackID);
     virtual nsresult Config(bool, uint32_t, bool, uint32_t, bool, uint32_t, int32_t);
     virtual bool IsFake();
diff --git a/dom/media/webrtc/MediaEngineWebRTC.h b/dom/media/webrtc/MediaEngineWebRTC.h
index 0954380e247..7ebb9d99992 100644
--- a/dom/media/webrtc/MediaEngineWebRTC.h
+++ b/dom/media/webrtc/MediaEngineWebRTC.h
@@ -97,8 +97,7 @@ public:
   virtual void NotifyPull(MediaStreamGraph* aGraph,
                           SourceMediaStream* aSource,
                           TrackID aId,
-                          StreamTime aDesiredTime,
-                          StreamTime &aLastEndTime);
+                          StreamTime aDesiredTime) MOZ_OVERRIDE;
 
   virtual const MediaSourceType GetMediaSource() {
     return mMediaSource;
@@ -180,8 +179,7 @@ public:
   virtual void NotifyPull(MediaStreamGraph* aGraph,
                           SourceMediaStream* aSource,
                           TrackID aId,
-                          StreamTime aDesiredTime,
-                          StreamTime &aLastEndTime);
+                          StreamTime aDesiredTime) MOZ_OVERRIDE;
 
   virtual bool IsFake() {
     return false;
diff --git a/dom/media/webrtc/MediaEngineWebRTCAudio.cpp b/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
index b95fea5641b..ba5378ab966 100644
--- a/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
+++ b/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
@@ -398,16 +398,10 @@ void
 MediaEngineWebRTCAudioSource::NotifyPull(MediaStreamGraph* aGraph,
                                          SourceMediaStream *aSource,
                                          TrackID aID,
-                                         StreamTime aDesiredTime,
-                                         StreamTime &aLastEndTime)
+                                         StreamTime aDesiredTime)
 {
   // Ignore - we push audio data
-#ifdef DEBUG
-  StreamTime delta = aDesiredTime - aLastEndTime;
-  LOG(("Audio: NotifyPull: aDesiredTime %ld, delta %ld",(int64_t) aDesiredTime,
-       (int64_t) delta));
-  aLastEndTime = aDesiredTime;
-#endif
+  LOG_FRAMES(("NotifyPull, desired = %ld", (int64_t) aDesiredTime));
 }
 
 void
diff --git a/dom/media/webrtc/MediaEngineWebRTCVideo.cpp b/dom/media/webrtc/MediaEngineWebRTCVideo.cpp
index 7558557e4f5..b2c73861c51 100644
--- a/dom/media/webrtc/MediaEngineWebRTCVideo.cpp
+++ b/dom/media/webrtc/MediaEngineWebRTCVideo.cpp
@@ -124,8 +124,7 @@ void
 MediaEngineWebRTCVideoSource::NotifyPull(MediaStreamGraph* aGraph,
                                          SourceMediaStream* aSource,
                                          TrackID aID,
-                                         StreamTime aDesiredTime,
-                                         StreamTime &aLastEndTime)
+                                         StreamTime aDesiredTime)
 {
   VideoSegment segment;
 
@@ -150,9 +149,7 @@ MediaEngineWebRTCVideoSource::NotifyPull(MediaStreamGraph* aGraph,
   // Doing so means a negative delta and thus messes up handling of the graph
   if (delta > 0) {
     // nullptr images are allowed
-    if (AppendToTrack(aSource, mImage, aID, delta)) {
-      aLastEndTime = aDesiredTime;
-    }
+    AppendToTrack(aSource, mImage, aID, delta);
   }
 }