Add OnRemoved() in VideoCapture::EventHandler API

media/video/capture/video_capture_proxy.cc

 // Copyright (c) 2011 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 "media/video/capture/video_capture_proxy.h"
 
 #include "base/location.h"
 #include "base/message_loop_proxy.h"
 
 namespace {
@@ skipping 50 matching lines @@
 
 void VideoCaptureHandlerProxy::OnError(VideoCapture* capture, int error_code) {
   main_message_loop_->PostTask(FROM_HERE, NewRunnableMethod(
       this,
       &VideoCaptureHandlerProxy::OnErrorOnMainThread,
       capture,
       GetState(capture),
       error_code));
 }
 
+void VideoCaptureHandlerProxy::OnRemoved(VideoCapture* capture) {
+  // TODO(vtl): add logic when this event handler is removed.
+}
+
 void VideoCaptureHandlerProxy::OnBufferReady(
     VideoCapture* capture,
     scoped_refptr<VideoCapture::VideoFrameBuffer> buffer) {
   main_message_loop_->PostTask(FROM_HERE, NewRunnableMethod(
       this,
       &VideoCaptureHandlerProxy::OnBufferReadyOnMainThread,
       capture,
       GetState(capture),
       buffer));
 }
@@ skipping 48 matching lines @@
 
 void VideoCaptureHandlerProxy::OnDeviceInfoReceivedOnMainThread(
     VideoCapture* capture,
     const VideoCaptureState& state,
     const VideoCaptureParams& device_info) {
   state_ = state;
   proxied_->OnDeviceInfoReceived(capture, device_info);
 }
 
 }  // namespace media