Refactoring: Merge VideoSenderConfig and AudioSenderConfig.

media/cast/cast_sender_impl.h

Index: media/cast/cast_sender_impl.h
diff --git a/media/cast/cast_sender_impl.h b/media/cast/cast_sender_impl.h
index 511c458c333b9678f00616a96b3b22a3d765a261..a16bc0f9c796b1904f723c6b5857956c6cd8a79e 100644
--- a/media/cast/cast_sender_impl.h
+++ b/media/cast/cast_sender_impl.h
@@ -27,14 +27,13 @@ class CastSenderImpl : public CastSender {
   CastSenderImpl(scoped_refptr<CastEnvironment> cast_environment,
                  CastTransport* const transport_sender);
 
-  void InitializeAudio(const AudioSenderConfig& audio_config,
+  void InitializeAudio(const FrameSenderConfig& audio_config,
                        const StatusChangeCallback& status_change_cb) final;
   void InitializeVideo(
-      const VideoSenderConfig& video_config,
+      const FrameSenderConfig& video_config,
       const StatusChangeCallback& status_change_cb,
       const CreateVideoEncodeAcceleratorCallback& create_vea_cb,
-      const CreateVideoEncodeMemoryCallback& create_video_encode_mem_cb)
-      final;
+      const CreateVideoEncodeMemoryCallback& create_video_encode_mem_cb) final;
 
   void SetTargetPlayoutDelay(base::TimeDelta new_target_playout_delay) final;