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

webrtc/api/objc/RTCMediaStreamTrack.mm

Index: webrtc/api/objc/RTCMediaStreamTrack.mm
diff --git a/webrtc/api/objc/RTCMediaStreamTrack.mm b/webrtc/api/objc/RTCMediaStreamTrack.mm
index 260c89d66e55af55d7f20ab3058903cdc87ff2e6..25979b38d9a32bd968d531bdc66a5553ec77f4d7 100644
--- a/webrtc/api/objc/RTCMediaStreamTrack.mm
+++ b/webrtc/api/objc/RTCMediaStreamTrack.mm
@@ -67,41 +67,29 @@
 + (webrtc::MediaStreamTrackInterface::TrackState)nativeTrackStateForState:
     (RTCMediaStreamTrackState)state {
   switch (state) {
-    case RTCMediaStreamTrackStateInitializing:
-      return webrtc::MediaStreamTrackInterface::kInitializing;
     case RTCMediaStreamTrackStateLive:
       return webrtc::MediaStreamTrackInterface::kLive;
     case RTCMediaStreamTrackStateEnded:
       return webrtc::MediaStreamTrackInterface::kEnded;
-    case RTCMediaStreamTrackStateFailed:
-      return webrtc::MediaStreamTrackInterface::kFailed;
   }
 }
 
 + (RTCMediaStreamTrackState)trackStateForNativeState:
     (webrtc::MediaStreamTrackInterface::TrackState)nativeState {
   switch (nativeState) {
-    case webrtc::MediaStreamTrackInterface::kInitializing:
-      return RTCMediaStreamTrackStateInitializing;
     case webrtc::MediaStreamTrackInterface::kLive:
       return RTCMediaStreamTrackStateLive;
     case webrtc::MediaStreamTrackInterface::kEnded:
       return RTCMediaStreamTrackStateEnded;
-    case webrtc::MediaStreamTrackInterface::kFailed:
-      return RTCMediaStreamTrackStateFailed;
   }
 }
 
 + (NSString *)stringForState:(RTCMediaStreamTrackState)state {
   switch (state) {
-    case RTCMediaStreamTrackStateInitializing:
-      return @"Initializing";
     case RTCMediaStreamTrackStateLive:
       return @"Live";
     case RTCMediaStreamTrackStateEnded:
       return @"Ended";
-    case RTCMediaStreamTrackStateFailed:
-      return @"Failed";
   }
 }