Revert 177182 - ViewTest.ChangeNativeViewHierarchyFindRoots failure

ash/shell/shell_delegate_impl.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 "ash/shell/shell_delegate_impl.h"
 
 #include "ash/caps_lock_delegate_stub.h"
 #include "ash/host/root_window_host_factory.h"
 #include "ash/shell/example_factory.h"
 #include "ash/shell/launcher_delegate_impl.h"
 #include "ash/shell/context_menu.h"
 #include "ash/shell/toplevel_window.h"
 #include "ash/shell_window_ids.h"
+#include "ash/wm/stacking_controller.h"
 #include "ash/wm/window_util.h"
 #include "base/message_loop.h"
 #include "ui/aura/window.h"
 
 namespace ash {
 namespace shell {
 
 ShellDelegateImpl::ShellDelegateImpl()
     : watcher_(NULL),
       launcher_delegate_(NULL),
@@ skipping 183 matching lines @@
 }
 
 double ShellDelegateImpl::GetSavedScreenMagnifierScale() {
   return std::numeric_limits<double>::min();
 }
 
 ui::MenuModel* ShellDelegateImpl::CreateContextMenu(aura::RootWindow* root) {
   return new ContextMenu(root);
 }
 
+aura::client::StackingClient* ShellDelegateImpl::CreateStackingClient() {
+  return new StackingController;
+}
+
 RootWindowHostFactory* ShellDelegateImpl::CreateRootWindowHostFactory() {
   return RootWindowHostFactory::Create();
 }
 
 }  // namespace shell
 }  // namespace ash