bug 1081766 clear mInitializedDecoders and mParentDecoder only once r=kinetik

--HG--
extra : rebase_source : 2652f33a99818ec842233fda29f155fe193b195f
extra : histedit_source : 5711775674d0d68e3e1e7cab48272cb1fa1694ec

content/media/mediasource/TrackBuffer.cpp

@@ -402,10 +402,12 @@ TrackBuffer::BreakCycles()
   for (uint32_t i = 0; i < mDecoders.Length(); ++i) {
     mDecoders[i]->GetReader()->BreakCycles();
   }
-  mInitializedDecoders.Clear();
   NS_DispatchToMainThread(new ReleaseDecoderTask(mDecoders));
   MOZ_ASSERT(mDecoders.IsEmpty());
-  mParentDecoder = nullptr;
+
+  // These are cleared in Shutdown()
+  MOZ_ASSERT(mInitializedDecoders.IsEmpty());
+  MOZ_ASSERT(!mParentDecoder);
 }
 
 void