Refactoring: Merge VideoSenderConfig and AudioSenderConfig.

media/cast/sender/video_encoder_impl.h

Index: media/cast/sender/video_encoder_impl.h
diff --git a/media/cast/sender/video_encoder_impl.h b/media/cast/sender/video_encoder_impl.h
index fa5b9c3b522703be1313669939e732c813f0a049..cd350e627d0869e82ccc8ecd1357b53046e6cebf 100644
--- a/media/cast/sender/video_encoder_impl.h
+++ b/media/cast/sender/video_encoder_impl.h
@@ -28,10 +28,10 @@ class VideoEncoderImpl : public VideoEncoder {
   };
 
   // Returns true if VideoEncoderImpl can be used with the given |video_config|.
-  static bool IsSupported(const VideoSenderConfig& video_config);
+  static bool IsSupported(const FrameSenderConfig& video_config);
 
   VideoEncoderImpl(scoped_refptr<CastEnvironment> cast_environment,
-                   const VideoSenderConfig& video_config,
+                   const FrameSenderConfig& video_config,
                    const StatusChangeCallback& status_change_cb);
 
   ~VideoEncoderImpl() final;