Revert of Refactoring: Merge VideoSenderConfig and AudioSenderConfig.

media/cast/sender/size_adaptable_video_encoder_base.h

Index: media/cast/sender/size_adaptable_video_encoder_base.h
diff --git a/media/cast/sender/size_adaptable_video_encoder_base.h b/media/cast/sender/size_adaptable_video_encoder_base.h
index 8443e2c09f66388b4cafd05a88fe8206594f8e97..ac2fd23507075976f9056b764069eef7f5dffad5 100644
--- a/media/cast/sender/size_adaptable_video_encoder_base.h
+++ b/media/cast/sender/size_adaptable_video_encoder_base.h
@@ -30,7 +30,7 @@
  public:
   SizeAdaptableVideoEncoderBase(
       const scoped_refptr<CastEnvironment>& cast_environment,
-      const FrameSenderConfig& video_config,
+      const VideoSenderConfig& video_config,
       const StatusChangeCallback& status_change_cb);
 
   ~SizeAdaptableVideoEncoderBase() override;
@@ -50,7 +50,9 @@
   CastEnvironment* cast_environment() const {
     return cast_environment_.get();
   }
-  const FrameSenderConfig& video_config() const { return video_config_; }
+  const VideoSenderConfig& video_config() const {
+    return video_config_;
+  }
   const gfx::Size& frame_size() const {
     return frame_size_;
   }
@@ -91,7 +93,7 @@
 
   // This is not const since |video_config_.starting_bitrate| is modified by
   // SetBitRate(), for when a replacement encoder is spawned.
-  FrameSenderConfig video_config_;
+  VideoSenderConfig video_config_;
 
   // Run whenever the underlying encoder reports a status change.
   const StatusChangeCallback status_change_cb_;