Delete VideoReceiveStream::Config::pre_render_callback.

webrtc/common_video/include/frame_callback.h

Index: webrtc/common_video/include/frame_callback.h
diff --git a/webrtc/common_video/include/frame_callback.h b/webrtc/common_video/include/frame_callback.h
index 0fa4458f5c467a14b226f964b692a428e13a8333..45624f1554aab8e4d606f19ed72f2cb997f16224 100644
--- a/webrtc/common_video/include/frame_callback.h
+++ b/webrtc/common_video/include/frame_callback.h
@@ -50,16 +50,6 @@ struct EncodedFrame {
   const uint32_t timestamp_;
 };
 
-class I420FrameCallback {
- public:
-  // This function is called with a I420 frame allowing the user to modify the
-  // frame content.
-  virtual void FrameCallback(VideoFrame* video_frame) = 0;
-
- protected:
-  virtual ~I420FrameCallback() {}
-};
-
 class EncodedFrameObserver {
  public:
   virtual void EncodedFrameCallback(const EncodedFrame& encoded_frame) = 0;