Simplify ScreenCapturer interface.

remoting/host/ipc_video_frame_capturer.cc

 // Copyright (c) 2012 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 "remoting/host/ipc_video_frame_capturer.h"
 
 #include "media/video/capture/screen/mouse_cursor_shape.h"
 #include "media/video/capture/screen/screen_capture_data.h"
 #include "remoting/host/desktop_session_proxy.h"
 
 namespace remoting {
 
 IpcVideoFrameCapturer::IpcVideoFrameCapturer(
     scoped_refptr<DesktopSessionProxy> desktop_session_proxy)
     : delegate_(NULL),
       desktop_session_proxy_(desktop_session_proxy),
       weak_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
 }
 
 IpcVideoFrameCapturer::~IpcVideoFrameCapturer() {
 }
 
 void IpcVideoFrameCapturer::Start(Delegate* delegate) {
   delegate_ = delegate;
   desktop_session_proxy_->SetVideoCapturer(weak_factory_.GetWeakPtr());
 }
 
-void IpcVideoFrameCapturer::Stop() {
-  delegate_ = NULL;
-  weak_factory_.InvalidateWeakPtrs();
-}
-
-void IpcVideoFrameCapturer::InvalidateRegion(const SkRegion& invalid_region) {
-  desktop_session_proxy_->InvalidateRegion(invalid_region);
-}
-
 void IpcVideoFrameCapturer::CaptureFrame() {
   desktop_session_proxy_->CaptureFrame();
 }
 
 void IpcVideoFrameCapturer::OnCaptureCompleted(
     scoped_refptr<media::ScreenCaptureData> capture_data) {
   if (delegate_)
     delegate_->OnCaptureCompleted(capture_data);
 }
 
 void IpcVideoFrameCapturer::OnCursorShapeChanged(
     scoped_ptr<media::MouseCursorShape> cursor_shape) {
   if (delegate_)
     delegate_->OnCursorShapeChanged(cursor_shape.Pass());
 }
 
 }  // namespace remoting