Tidy up MediaStreamSource details.

third_party/WebKit/Source/platform/mediastream/MediaStreamComponent.h

 /*
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 35 matching lines @@
 
 // A MediaStreamComponent is a MediaStreamTrack.
 // TODO(hta): Consider merging the two classes.
 
 class PLATFORM_EXPORT MediaStreamComponent final : public GarbageCollectedFinalized<MediaStreamComponent> {
     USING_PRE_FINALIZER(MediaStreamComponent, dispose);
 public:
     // This class represents whatever data the Web layer uses to represent
     // a track. It needs to be able to answer the getSettings question.
     class TrackData {
+        USING_FAST_MALLOC(TrackData);
     public:
         virtual void getSettings(WebMediaStreamTrack::Settings&) = 0;
         virtual ~TrackData() {}
     };
 
     static MediaStreamComponent* create(MediaStreamSource*);
     static MediaStreamComponent* create(const String& id, MediaStreamSource*);
 
     // |m_trackData| may hold pointers to GC objects indirectly, and it may touch
     // eagerly finalized objects in destruction.
@@ skipping 48 matching lines @@
     bool m_enabled;
     bool m_muted;
     OwnPtr<TrackData> m_trackData;
 };
 
 typedef HeapVector<Member<MediaStreamComponent>> MediaStreamComponentVector;
 
 } // namespace blink
 
 #endif // MediaStreamComponent_h