From b0e43ad5a9c9d3ac3584e92a431abc2f35a51cc1 Mon Sep 17 00:00:00 2001
From: Ehsan Akhgari <ehsan@mozilla.com>
Date: Sun, 17 Mar 2013 21:26:45 -0400
Subject: [PATCH] Bug 851986 - Avoid calling a virtual function when getting
 the source for an AudioNodeStream; r=roc

---
 content/media/AudioNodeStream.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/content/media/AudioNodeStream.cpp b/content/media/AudioNodeStream.cpp
index 8bc89902d4d..77d8625ba6e 100644
--- a/content/media/AudioNodeStream.cpp
+++ b/content/media/AudioNodeStream.cpp
@@ -184,8 +184,8 @@ AudioNodeStream::ObtainInputBlock(AudioChunk* aTmpChunk)
   nsAutoTArray<AudioChunk*,250> inputChunks;
   for (uint32_t i = 0; i < inputCount; ++i) {
     MediaStream* s = mInputs[i]->GetSource();
-    AudioNodeStream* a = s->AsAudioNodeStream();
-    MOZ_ASSERT(a);
+    AudioNodeStream* a = static_cast<AudioNodeStream*>(s);
+    MOZ_ASSERT(a == s->AsAudioNodeStream());
     if (a->IsFinishedOnGraphThread()) {
       continue;
     }