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

talk/app/webrtc/objc/RTCEnumConverter.mm

Index: talk/app/webrtc/objc/RTCEnumConverter.mm
diff --git a/talk/app/webrtc/objc/RTCEnumConverter.mm b/talk/app/webrtc/objc/RTCEnumConverter.mm
index f8ab8383e4588608aae974558c720ecc969ee4dd..03b249c3a7132c095bea9a06fd456e7c0cf429e6 100644
--- a/talk/app/webrtc/objc/RTCEnumConverter.mm
+++ b/talk/app/webrtc/objc/RTCEnumConverter.mm
@@ -111,28 +111,20 @@
 + (webrtc::MediaStreamTrackInterface::TrackState)
     convertTrackStateToNative:(RTCTrackState)state {
   switch (state) {
-    case RTCTrackStateInitializing:
-      return webrtc::MediaStreamTrackInterface::kInitializing;
     case RTCTrackStateLive:
       return webrtc::MediaStreamTrackInterface::kLive;
     case RTCTrackStateEnded:
       return webrtc::MediaStreamTrackInterface::kEnded;
-    case RTCTrackStateFailed:
-      return webrtc::MediaStreamTrackInterface::kFailed;
   }
 }
 
 + (RTCTrackState)convertTrackStateToObjC:
     (webrtc::MediaStreamTrackInterface::TrackState)nativeState {
   switch (nativeState) {
-    case webrtc::MediaStreamTrackInterface::kInitializing:
-      return RTCTrackStateInitializing;
     case webrtc::MediaStreamTrackInterface::kLive:
       return RTCTrackStateLive;
     case webrtc::MediaStreamTrackInterface::kEnded:
       return RTCTrackStateEnded;
-    case webrtc::MediaStreamTrackInterface::kFailed:
-      return RTCTrackStateFailed;
   }
 }