Revert of Oilpan: Move MediaStreamSource, MediaStreamComponent and MediaStreamDescriptor

public/platform/WebMediaStreamTrack.h

Index: public/platform/WebMediaStreamTrack.h
diff --git a/public/platform/WebMediaStreamTrack.h b/public/platform/WebMediaStreamTrack.h
index 04598a765da4952ee950fff4fff675163818d4ea..d49565f5714199e146d2713c209129f2d439b36b 100644
--- a/public/platform/WebMediaStreamTrack.h
+++ b/public/platform/WebMediaStreamTrack.h
@@ -41,8 +41,17 @@
 public:
     class ExtraData {
     public:
-        ExtraData() { }
+        ExtraData() : m_owner(0) { }
         virtual ~ExtraData() { }
+
+        BLINK_PLATFORM_EXPORT WebMediaStreamTrack owner();
+
+#if INSIDE_BLINK
+        BLINK_PLATFORM_EXPORT void setOwner(MediaStreamComponent*);
+#endif
+
+    private:
+        MediaStreamComponent* m_owner;
     };
 
     WebMediaStreamTrack() { }
@@ -80,8 +89,10 @@
     BLINK_PLATFORM_EXPORT void setSourceProvider(WebAudioSourceProvider*);
 
 #if INSIDE_BLINK
+    BLINK_PLATFORM_EXPORT WebMediaStreamTrack(PassRefPtr<MediaStreamComponent>);
     BLINK_PLATFORM_EXPORT WebMediaStreamTrack(MediaStreamComponent*);
     BLINK_PLATFORM_EXPORT WebMediaStreamTrack& operator=(MediaStreamComponent*);
+    BLINK_PLATFORM_EXPORT operator WTF::PassRefPtr<MediaStreamComponent>() const;
     BLINK_PLATFORM_EXPORT operator MediaStreamComponent*() const;
 #endif