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

ash/shell.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_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 72 matching lines @@
 class GPUSupport;
 class HighContrastController;
 class LockStateController;
 class MagnificationController;
 class MediaDelegate;
 class MruWindowTracker;
 class NestedDispatcherController;
 class NewWindowDelegate;
 class PartialMagnificationController;
 class PowerButtonController;
-class WindowTreeHostFactory;
 class ScreenAsh;
 class SessionStateDelegate;
 class Shelf;
 class ShelfDelegate;
 class ShelfItemDelegateManager;
 class ShelfModel;
 class ShellDelegate;
 class ShellObserver;
 class StickyKeysController;
 class SystemTray;
@@ skipping 413 matching lines @@
   internal::ResolutionNotificationController*
       resolution_notification_controller() {
     return resolution_notification_controller_.get();
   }
 
   internal::LogoutConfirmationController* logout_confirmation_controller() {
     return logout_confirmation_controller_.get();
   }
 #endif  // defined(OS_CHROMEOS)
 
-  WindowTreeHostFactory* window_tree_host_factory() {
-    return window_tree_host_factory_.get();
-  }
-
   ShelfModel* shelf_model() {
     return shelf_model_.get();
   }
 
   WindowPositioner* window_positioner() {
     return window_positioner_.get();
   }
 
   // Returns the launcher delegate, creating if necesary.
   ShelfDelegate* GetShelfDelegate();
@@ skipping 120 matching lines @@
   scoped_ptr<PartialMagnificationController> partial_magnification_controller_;
   scoped_ptr<AutoclickController> autoclick_controller_;
   scoped_ptr<aura::client::FocusClient> focus_client_;
   aura::client::ActivationClient* activation_client_;
   scoped_ptr<internal::MouseCursorEventFilter> mouse_cursor_filter_;
   scoped_ptr<internal::ScreenPositionController> screen_position_controller_;
   scoped_ptr<internal::SystemModalContainerEventFilter> modality_filter_;
   scoped_ptr<internal::EventClientImpl> event_client_;
   scoped_ptr<internal::EventTransformationHandler>
       event_transformation_handler_;
-  scoped_ptr<WindowTreeHostFactory> window_tree_host_factory_;
 
   // An event filter that pre-handles key events while the partial
   // screenshot UI or the keyboard overlay is active.
   scoped_ptr<internal::OverlayEventFilter> overlay_filter_;
 
   // An event filter for logging keyboard-related metrics.
   scoped_ptr<internal::KeyboardUMAEventFilter> keyboard_metrics_filter_;
 
   // An event filter which handles moving and resizing windows.
   scoped_ptr<ToplevelWindowEventHandler> toplevel_window_event_handler_;
@@ skipping 60 matching lines @@
 
   // Injected content::GPUDataManager support.
   scoped_ptr<GPUSupport> gpu_support_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_