mash: Move ShelfWindowWatcher[ItemDelegate] to ash/common.

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 <memory>
 #include <utility>
 #include <vector>
@@ skipping 99 matching lines @@
 class ResolutionNotificationController;
 class RootWindowController;
 class ScopedOverviewAnimationSettingsFactoryAura;
 class ScreenAsh;
 class ScreenOrientationController;
 class ScreenshotController;
 class ScreenPinningController;
 class ScreenPositionController;
 class SessionStateDelegate;
 class Shelf;
-class ShelfWindowWatcher;
 class ShellDelegate;
 struct ShellInitParams;
 class SlowAnimationEventFilter;
 class StatusAreaWidget;
 class StickyKeysController;
 class SystemGestureEventFilter;
 class SystemModalContainerEventFilter;
 class SystemTray;
 class ToplevelWindowEventHandler;
 class TouchTransformerController;
@@ skipping 385 matching lines @@
   std::unique_ptr<::wm::CompoundEventFilter> env_filter_;
 
   std::vector<WindowAndBoundsPair> to_restore_;
 
   std::unique_ptr<UserMetricsRecorder> user_metrics_recorder_;
   std::unique_ptr<AcceleratorControllerDelegateAura>
       accelerator_controller_delegate_;
   std::unique_ptr<UserWallpaperDelegate> user_wallpaper_delegate_;
   std::unique_ptr<SessionStateDelegate> session_state_delegate_;
   std::unique_ptr<PointerWatcherDelegate> pointer_watcher_delegate_;
-  std::unique_ptr<ShelfWindowWatcher> shelf_window_watcher_;
   std::unique_ptr<WindowPositioner> window_positioner_;
 
   std::unique_ptr<DragDropController> drag_drop_controller_;
   std::unique_ptr<ResizeShadowController> resize_shadow_controller_;
   std::unique_ptr<::wm::ShadowController> shadow_controller_;
   std::unique_ptr<::wm::VisibilityController> visibility_controller_;
   std::unique_ptr<::wm::WindowModalityController> window_modality_controller_;
   std::unique_ptr<views::corewm::TooltipController> tooltip_controller_;
   std::unique_ptr<DesktopBackgroundController> desktop_background_controller_;
   LinkHandlerModelFactory* link_handler_model_factory_;
@@ skipping 87 matching lines @@
   base::SequencedWorkerPool* blocking_pool_;
 
   bool in_mus_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_