Bug 1128113 - Skip mSharedDecoderManager which is part of MozMP4. r=jya, a=bustage

dom/media/mediasource/MediaSourceReader.cpp

@@ -399,10 +399,12 @@ MediaSourceReader::ContinueShutdown()
   mVideoTrack = nullptr;
   mVideoReader = nullptr;
 
+#ifdef MOZ_FMP4
   if (mSharedDecoderManager) {
     mSharedDecoderManager->Shutdown();
     mSharedDecoderManager = nullptr;
   }
+#endif
 
   MOZ_ASSERT(mAudioPromise.IsEmpty());
   MOZ_ASSERT(mVideoPromise.IsEmpty());