Revert of Refactoring: Merge VideoSenderConfig and AudioSenderConfig.

media/cast/cast_sender.h

Index: media/cast/cast_sender.h
diff --git a/media/cast/cast_sender.h b/media/cast/cast_sender.h
index 12c570b766b7b90e6d72ee58574cda4bdda906b0..9e02c350ec81a6599b5ea91ccbd966a3c4cbfb50 100644
--- a/media/cast/cast_sender.h
+++ b/media/cast/cast_sender.h
@@ -104,7 +104,7 @@
   // Initialize the audio stack. Must be called in order to send audio frames.
   // |status_change_cb| will be run as operational status changes.
   virtual void InitializeAudio(
-      const FrameSenderConfig& audio_config,
+      const AudioSenderConfig& audio_config,
       const StatusChangeCallback& status_change_cb) = 0;
 
   // Initialize the video stack. Must be called in order to send video frames.
@@ -112,7 +112,7 @@
   //
   // TODO(miu): Remove the VEA-specific callbacks.  http://crbug.com/454029
   virtual void InitializeVideo(
-      const FrameSenderConfig& video_config,
+      const VideoSenderConfig& video_config,
       const StatusChangeCallback& status_change_cb,
       const CreateVideoEncodeAcceleratorCallback& create_vea_cb,
       const CreateVideoEncodeMemoryCallback& create_video_encode_mem_cb) = 0;