diff --git a/dom/media/MediaRecorder.cpp b/dom/media/MediaRecorder.cpp
index 86491499951..1f15374dde3 100644
--- a/dom/media/MediaRecorder.cpp
+++ b/dom/media/MediaRecorder.cpp
@@ -368,12 +368,11 @@ class MediaRecorder::Session: public nsIObserver
 
 public:
   Session(MediaRecorder* aRecorder, int32_t aTimeSlice)
-    : mRecorder(aRecorder)
-    , mTimeSlice(aTimeSlice)
-    , mStopIssued(false)
-    , mCanRetrieveData(false)
-    , mIsRegisterProfiler(false)
-    , mNeedSessionEndTask(true)
+    : mRecorder(aRecorder),
+      mTimeSlice(aTimeSlice),
+      mStopIssued(false),
+      mCanRetrieveData(false),
+      mIsRegisterProfiler(false)
   {
     MOZ_ASSERT(NS_IsMainThread());
 
@@ -397,11 +396,6 @@ public:
     MOZ_ASSERT(NS_IsMainThread());
     mStopIssued = true;
     CleanupStreams();
-    if (mNeedSessionEndTask) {
-      LOG(PR_LOG_DEBUG, ("Session.Stop mNeedSessionEndTask %p", this));
-      // End the Session directly if there is no ExtractRunnable.
-      DoSessionEndTask(NS_OK);
-    }
     nsContentUtils::UnregisterShutdownObserver(this);
   }
 
@@ -584,10 +578,6 @@ private:
     LOG(PR_LOG_DEBUG, ("Session.InitEncoder %p", this));
     MOZ_ASSERT(NS_IsMainThread());
 
-    if (!mRecorder) {
-      LOG(PR_LOG_DEBUG, ("Session.InitEncoder failure, mRecorder is null %p", this));
-      return;
-    }
     // Allocate encoder and bind with union stream.
     // At this stage, the API doesn't allow UA to choose the output mimeType format.
 
@@ -599,7 +589,6 @@ private:
     }
 
     if (!mEncoder) {
-      LOG(PR_LOG_DEBUG, ("Session.InitEncoder !mEncoder %p", this));
       DoSessionEndTask(NS_ERROR_ABORT);
       return;
     }
@@ -608,7 +597,6 @@ private:
     // The Session::stop would clean the mTrackUnionStream. If the AfterTracksAdded
     // comes after stop command, this function would crash.
     if (!mTrackUnionStream) {
-      LOG(PR_LOG_DEBUG, ("Session.InitEncoder !mTrackUnionStream %p", this));
       DoSessionEndTask(NS_OK);
       return;
     }
@@ -617,26 +605,19 @@ private:
     if (!mReadThread) {
       nsresult rv = NS_NewNamedThread("Media_Encoder", getter_AddRefs(mReadThread));
       if (NS_FAILED(rv)) {
-        LOG(PR_LOG_DEBUG, ("Session.InitEncoder !mReadThread %p", this));
         DoSessionEndTask(rv);
         return;
       }
     }
 
-    // In case source media stream does not notify track end, receive
+    // In case source media stream does not notify track end, recieve
     // shutdown notification and stop Read Thread.
     nsContentUtils::RegisterShutdownObserver(this);
 
     nsCOMPtr<nsIRunnable> event = new ExtractRunnable(this);
     if (NS_FAILED(mReadThread->Dispatch(event, NS_DISPATCH_NORMAL))) {
       NS_WARNING("Failed to dispatch ExtractRunnable at beginning");
-      LOG(PR_LOG_DEBUG, ("Session.InitEncoder !ReadThread->Dispatch %p", this));
-      DoSessionEndTask(NS_ERROR_ABORT);
     }
-    // Set mNeedSessionEndTask to false because the
-    // ExtractRunnable/DestroyRunnable will take the response to
-    // end the session.
-    mNeedSessionEndTask = false;
   }
   // application should get blob and onstop event
   void DoSessionEndTask(nsresult rv)
@@ -656,7 +637,6 @@ private:
     if (NS_FAILED(NS_DispatchToMainThread(new DestroyRunnable(this)))) {
       MOZ_ASSERT(false, "NS_DispatchToMainThread DestroyRunnable failed");
     }
-    mNeedSessionEndTask = false;
   }
   void CleanupStreams()
   {
@@ -730,10 +710,6 @@ private:
   bool mCanRetrieveData;
   // The register flag for "Media_Encoder" thread to profiler
   bool mIsRegisterProfiler;
-  // False if the InitEncoder called successfully, ensure the
-  // ExtractRunnable/DestroyRunnable will end the session.
-  // Main thread only.
-  bool mNeedSessionEndTask;
 };
 
 NS_IMPL_ISUPPORTS(MediaRecorder::Session, nsIObserver)