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

ash/test/test_shell_delegate.h

 // 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.
 
 #ifndef ASH_TEST_TEST_SHELL_DELEGATE_H_
 #define ASH_TEST_TEST_SHELL_DELEGATE_H_
 
 #include <string>
 
 #include "ash/shell_delegate.h"
@@ skipping 34 matching lines @@
   virtual SystemTrayDelegate* CreateSystemTrayDelegate() OVERRIDE;
   virtual UserWallpaperDelegate* CreateUserWallpaperDelegate() OVERRIDE;
   virtual SessionStateDelegate* CreateSessionStateDelegate() OVERRIDE;
   virtual AccessibilityDelegate* CreateAccessibilityDelegate() OVERRIDE;
   virtual NewWindowDelegate* CreateNewWindowDelegate() OVERRIDE;
   virtual MediaDelegate* CreateMediaDelegate() OVERRIDE;
   virtual ui::MenuModel* CreateContextMenu(
       aura::Window* root,
       ash::ShelfItemDelegate* item_delegate,
       ash::ShelfItem* item) OVERRIDE;
-  virtual WindowTreeHostFactory* CreateWindowTreeHostFactory() OVERRIDE;
   virtual GPUSupport* CreateGPUSupport() OVERRIDE;
   virtual base::string16 GetProductName() const OVERRIDE;
 
   int num_exit_requests() const { return num_exit_requests_; }
 
   TestSessionStateDelegate* test_session_state_delegate();
 
  private:
   int num_exit_requests_;
   bool multi_profiles_enabled_;
 
   scoped_ptr<content::BrowserContext> active_browser_context_;
 
   TestSessionStateDelegate* test_session_state_delegate_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(TestShellDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_SHELL_DELEGATE_H_