Reland: Change VideoCaptureDeliverFrameCB's signature

content/renderer/media/video_track_recorder.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/video_track_recorder.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/sys_info.h"
 #include "base/threading/thread.h"
@@ skipping 287 matching lines @@
 }
 
 VideoTrackRecorder::~VideoTrackRecorder() {
   DCHECK(main_render_thread_checker_.CalledOnValidThread());
   RemoveFromVideoTrack(this, track_);
   weak_factory_.InvalidateWeakPtrs();
   track_.reset();
 }
 
 void VideoTrackRecorder::OnVideoFrame(const scoped_refptr<VideoFrame>& frame,
-                                      const base::TimeTicks& timestamp) {
+                                      base::TimeTicks timestamp) {
   DCHECK(main_render_thread_checker_.CalledOnValidThread());
   encoder_->StartFrameEncode(frame, timestamp);
 }
 
 }  // namespace content