Remove restart method from VideoTrackSourceInterface.

webrtc/api/videocapturertracksource.cc

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 358 matching lines @@
 void VideoCapturerTrackSource::Stop() {
   if (!started_) {
     return;
   }
   started_ = false;
   worker_thread_->Invoke<void>(
       RTC_FROM_HERE,
       rtc::Bind(&cricket::VideoCapturer::Stop, video_capturer_.get()));
 }
 
-void VideoCapturerTrackSource::Restart() {
-  if (started_) {
-    return;
-  }
-  if (!worker_thread_->Invoke<bool>(
-          RTC_FROM_HERE, rtc::Bind(&cricket::VideoCapturer::StartCapturing,
-                                   video_capturer_.get(), format_))) {
-    SetState(kEnded);
-    return;
-  }
-  started_ = true;
-}
-
 // OnStateChange listens to the cricket::VideoCapturer::SignalStateChange.
 void VideoCapturerTrackSource::OnStateChange(
     cricket::VideoCapturer* capturer,
     cricket::CaptureState capture_state) {
   if (rtc::Thread::Current() != signaling_thread_) {
     invoker_.AsyncInvoke<void>(
         RTC_FROM_HERE, signaling_thread_,
         rtc::Bind(&VideoCapturerTrackSource::OnStateChange, this, capturer,
                   capture_state));
     return;
   }
 
   if (capturer == video_capturer_.get()) {
     SetState(GetReadyState(capture_state));
   }
 }
 
 }  // namespace webrtc