[Cast] Repurpose CastInitializationStatus for variable frame size support.

media/cast/receiver/video_decoder.h

Index: media/cast/receiver/video_decoder.h
diff --git a/media/cast/receiver/video_decoder.h b/media/cast/receiver/video_decoder.h
index f3d8ca202ea635708aceba2e9ac00255b8a60707..2b6c859c6795cf8ceaa3cbc717f2d1a49040171f 100644
--- a/media/cast/receiver/video_decoder.h
+++ b/media/cast/receiver/video_decoder.h
@@ -31,10 +31,10 @@ class VideoDecoder {
                Codec codec);
   virtual ~VideoDecoder();
 
-  // Returns STATUS_VIDEO_INITIALIZED if the decoder was successfully
-  // constructed from the given FrameReceiverConfig.  If this method returns any
-  // other value, calls to DecodeFrame() will not succeed.
-  CastInitializationStatus InitializationResult() const;
+  // Returns STATUS_INITIALIZED if the decoder was successfully constructed from
+  // the given FrameReceiverConfig.  If this method returns any other value,
+  // calls to DecodeFrame() will not succeed.
+  OperationalStatus InitializationResult() const;
 
   // Decode the payload in |encoded_frame| asynchronously.  |callback| will be
   // invoked on the CastEnvironment::MAIN thread with the result.