Adds views::corewm::WMState to install common state

chrome/browser/ui/views/chrome_browser_main_extra_parts_views.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 "chrome/browser/ui/views/chrome_browser_main_extra_parts_views.h"
 
 #include "chrome/browser/chrome_browser_main.h"
 #include "chrome/browser/ui/views/chrome_views_delegate.h"
 #include "chrome/common/chrome_switches.h"
 #include "ui/base/ui_base_switches.h"
 
 #if defined(USE_AURA)
-#include "ui/views/corewm/transient_window_stacking_client.h"
+#include "ui/views/corewm/wm_state.h"
 #endif
 
 ChromeBrowserMainExtraPartsViews::ChromeBrowserMainExtraPartsViews() {
 }
 
+ChromeBrowserMainExtraPartsViews::~ChromeBrowserMainExtraPartsViews() {
+}
+
 void ChromeBrowserMainExtraPartsViews::ToolkitInitialized() {
   // The delegate needs to be set before any UI is created so that windows
   // display the correct icon.
   if (!views::ViewsDelegate::views_delegate)
     views::ViewsDelegate::views_delegate = new ChromeViewsDelegate;
 
 #if defined(USE_AURA)
-  // SetWindowStackingClient() takes ownership of TransientWindowStackingClient.
-  aura::client::SetWindowStackingClient(
-      new views::corewm::TransientWindowStackingClient);
+  wm_state_.reset(new views::corewm::WMState);
 #endif
 }