Make GetRootWindow() return a Window instead of a RootWindow.

ui/aura/client/default_capture_client.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 "ui/aura/client/default_capture_client.h"
 
 #include "ui/aura/root_window.h"
 
 namespace aura {
 namespace client {
@@ skipping 12 matching lines @@
   if (capture_window_ == window)
     return;
   if (window) {
     ui::GestureRecognizer::Get()->TransferEventsTo(
         capture_window_, window);
   }
 
   Window* old_capture_window = capture_window_;
   capture_window_ = window;
 
-  CaptureDelegate* capture_delegate = root_window_->GetRootWindow();
+  CaptureDelegate* capture_delegate = root_window_->GetDispatcher();
   if (capture_window_)
     capture_delegate->SetNativeCapture();
   else
     capture_delegate->ReleaseNativeCapture();
 
   capture_delegate->UpdateCapture(old_capture_window, capture_window_);
 }
 
 void DefaultCaptureClient::ReleaseCapture(Window* window) {
   if (capture_window_ != window)
     return;
   SetCapture(NULL);
 }
 
 Window* DefaultCaptureClient::GetCaptureWindow() {
   return capture_window_;
 }
 
 }  // namespace client
 }  // namespace aura