Propagate MediaStreamSource state to video tracks the same way as audio.

webrtc/api/mediastreaminterface.h

Index: webrtc/api/mediastreaminterface.h
diff --git a/webrtc/api/mediastreaminterface.h b/webrtc/api/mediastreaminterface.h
index 69a50c97a3311b0e3259be0ea638e932e33e47dc..a1ab675ab03adcc87c0872799f5c4bf5d2321e55 100644
--- a/webrtc/api/mediastreaminterface.h
+++ b/webrtc/api/mediastreaminterface.h
@@ -80,10 +80,8 @@ class MediaStreamTrackInterface : public rtc::RefCountInterface,
                                   public NotifierInterface {
  public:
   enum TrackState {
-    kInitializing,  // Track is beeing negotiated.
-    kLive = 1,  // Track alive
-    kEnded = 2,  // Track have ended
-    kFailed = 3,  // Track negotiation failed.
+    kLive,
+    kEnded,
   };
 
   static const char kAudioKind[];