Make aura::clients take Window instead of RootWindow

ui/aura/client/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/capture_client.h"
 
 #include "ui/aura/root_window.h"
 #include "ui/aura/window_property.h"
 
 DECLARE_WINDOW_PROPERTY_TYPE(aura::client::CaptureClient*)
 
 namespace aura {
 namespace client {
 
 DEFINE_WINDOW_PROPERTY_KEY(
     CaptureClient*, kRootWindowCaptureClientKey, NULL);
 
-void SetCaptureClient(RootWindow* root_window, CaptureClient* client) {
+void SetCaptureClient(Window* root_window, CaptureClient* client) {
   root_window->SetProperty(kRootWindowCaptureClientKey, client);
 }
 
-CaptureClient* GetCaptureClient(RootWindow* root_window) {
+CaptureClient* GetCaptureClient(Window* root_window) {
   return root_window ?
       root_window->GetProperty(kRootWindowCaptureClientKey) : NULL;
 }
 
 Window* GetCaptureWindow(Window* window) {
-  RootWindow* root_window = window->GetRootWindow();
+  Window* root_window = window->GetRootWindow();
   if (!root_window)
     return NULL;
   CaptureClient* capture_client = GetCaptureClient(root_window);
   return capture_client ? capture_client->GetCaptureWindow() : NULL;
 }
 
 }  // namespace client
 }  // namespace aura