Introdcue AshWindowTreeHost and move ash/chrome specific code in WTH to ash.

chrome/browser/ui/ash/chrome_shell_delegate.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/ash/chrome_shell_delegate.h"
 
 #include "apps/app_window.h"
 #include "apps/app_window_registry.h"
 #include "ash/content_support/gpu_support_impl.h"
-#include "ash/host/window_tree_host_factory.h"
 #include "ash/magnifier/magnifier_constants.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
 #include "base/command_line.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/app_list/app_list_service.h"
 #include "chrome/browser/ui/app_list/app_list_view_delegate.h"
 #include "chrome/browser/ui/ash/app_list/app_list_controller_ash.h"
@@ skipping 108 matching lines @@
   // Don't show context menu for exclusive app runtime mode.
   if (chrome::IsRunningInAppMode())
     return NULL;
 
   if (item_delegate && item)
     return new LauncherContextMenu(shelf_delegate_, item_delegate, item, root);
 
   return new LauncherContextMenu(shelf_delegate_, root);
 }
 
-ash::WindowTreeHostFactory* ChromeShellDelegate::CreateWindowTreeHostFactory() {
-  return ash::WindowTreeHostFactory::Create();
-}
-
 ash::GPUSupport* ChromeShellDelegate::CreateGPUSupport() {
   // Chrome uses real GPU support.
   return new ash::GPUSupportImpl;
 }
 
 base::string16 ChromeShellDelegate::GetProductName() const {
   return l10n_util::GetStringUTF16(IDS_PRODUCT_NAME);
 }
 
 keyboard::KeyboardControllerProxy*
     ChromeShellDelegate::CreateKeyboardControllerProxy() {
   return new AshKeyboardControllerProxy();
 }