views: Extract Widget observer into its own header file.

ash/wm/app_list_controller.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_WM_APP_LIST_CONTROLLER_H_
 #define ASH_WM_APP_LIST_CONTROLLER_H_
 
 #include "ash/launcher/launcher_icon_observer.h"
 #include "ash/shell_observer.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/timer.h"
 #include "ui/aura/event_filter.h"
 #include "ui/aura/focus_change_observer.h"
 #include "ui/aura/root_window_observer.h"
 #include "ui/compositor/layer_animation_observer.h"
-#include "ui/views/widget/widget.h"
+#include "ui/views/widget/widget_observer.h"
 
 namespace app_list {
 class AppListView;
 class PaginationModel;
 }
 
 namespace aura {
 class LocatedEvent;
 }
 
 namespace ash {
 namespace internal {
 
 // AppListController is a controller that manages app list UI for shell.
 // It creates AppListView and schedules showing/hiding animation.
 // While the UI is visible, it monitors things such as app list widget's
 // activation state and desktop mouse click to auto dismiss the UI.
 class AppListController : public aura::EventFilter,
                           public aura::FocusChangeObserver,
                           public aura::RootWindowObserver,
                           public ui::ImplicitAnimationObserver,
-                          public views::Widget::Observer,
+                          public views::WidgetObserver,
                           public ShellObserver,
                           public LauncherIconObserver {
  public:
   AppListController();
   virtual ~AppListController();
 
   // Show/hide app list window.
   void SetVisible(bool visible);
 
   // Whether app list window is visible (shown or being shown).
@@ skipping 37 matching lines @@
   // aura::FocusChangeObserver overrides:
   virtual void OnWindowFocused(aura::Window* window) OVERRIDE;
 
   // aura::RootWindowObserver overrides:
   virtual void OnRootWindowResized(const aura::RootWindow* root,
                                    const gfx::Size& old_size) OVERRIDE;
 
   // ui::ImplicitAnimationObserver overrides:
   virtual void OnImplicitAnimationsCompleted() OVERRIDE;
 
-  // views::Widget::Observer overrides:
+  // views::WidgetObserver overrides:
   virtual void OnWidgetClosing(views::Widget* widget) OVERRIDE;
 
   // ShellObserver overrides:
   virtual void OnShelfAlignmentChanged() OVERRIDE;
 
   // LauncherIconObserver overrides:
   virtual void OnLauncherIconPositionsChanged() OVERRIDE;
 
   scoped_ptr<app_list::PaginationModel> pagination_model_;
 
   // Whether we should show or hide app list widget.
   bool is_visible_;
 
   // The AppListView this class manages, owned by its widget.
   app_list::AppListView* view_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_APP_LIST_CONTROLLER_H_