Delete cricket::VideoFrame::ConvertToRgbBuffer.

webrtc/media/engine/webrtcvideoframe.cc

Index: webrtc/media/engine/webrtcvideoframe.cc
diff --git a/webrtc/media/engine/webrtcvideoframe.cc b/webrtc/media/engine/webrtcvideoframe.cc
index 3102b05f77d0e3e74687cfea390fac720d9fb391..ecae7b1b22030ad4c9854a264a8258868ef0c7ae 100644
--- a/webrtc/media/engine/webrtcvideoframe.cc
+++ b/webrtc/media/engine/webrtcvideoframe.cc
@@ -103,15 +103,6 @@ webrtc::VideoRotation WebRtcVideoFrame::rotation() const {
   return rotation_;
 }
 
-size_t WebRtcVideoFrame::ConvertToRgbBuffer(uint32_t to_fourcc,
-                                            uint8_t* buffer,
-                                            size_t size,
-                                            int stride_rgb) const {
-  RTC_CHECK(video_frame_buffer_);
-  RTC_CHECK(video_frame_buffer_->native_handle() == nullptr);
-  return VideoFrame::ConvertToRgbBuffer(to_fourcc, buffer, size, stride_rgb);
-}
-
 bool WebRtcVideoFrame::Reset(uint32_t format,
                              int w,
                              int h,