views: Extract Widget observer into its own header file.

chrome/browser/ui/views/frame/app_non_client_frame_view_aura.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 CHROME_BROWSER_UI_VIEWS_FRAME_APP_NON_CLIENT_FRAME_VIEW_AURA_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_APP_NON_CLIENT_FRAME_VIEW_AURA_H_
 
 #include "chrome/browser/ui/views/frame/browser_non_client_frame_view.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/mouse_watcher.h"
-#include "ui/views/widget/widget.h"
+#include "ui/views/widget/widget_observer.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ui {
 class SlideAnimation;
 }
 
 // NonClientFrameViewAura implementation for apps.
 class AppNonClientFrameViewAura : public BrowserNonClientFrameView,
                                   public views::MouseWatcherListener,
-                                  public views::Widget::Observer {
+                                  public views::WidgetObserver {
  public:
   AppNonClientFrameViewAura(
       BrowserFrame* frame, BrowserView* browser_view);
   virtual ~AppNonClientFrameViewAura();
 
   // NonClientFrameView:
   virtual gfx::Rect GetBoundsForClientView() const OVERRIDE;
   virtual gfx::Rect GetWindowBoundsForClientBounds(
       const gfx::Rect& client_bounds) const OVERRIDE;
   virtual int NonClientHitTest(const gfx::Point& point) OVERRIDE;
   virtual void GetWindowMask(
       const gfx::Size& size,
       gfx::Path* window_mask) OVERRIDE;
   virtual void ResetWindowControls() OVERRIDE;
   virtual void UpdateWindowIcon() OVERRIDE;
 
   // BrowserNonClientFrameView:
   virtual gfx::Rect GetBoundsForTabStrip(
       views::View* tabstrip) const OVERRIDE;
   virtual TabStripInsets GetTabStripInsets(bool restored) const OVERRIDE;
   virtual void UpdateThrobber(bool running) OVERRIDE;
 
   // View:
   virtual void OnMouseEntered(const views::MouseEvent& event) OVERRIDE;
 
   // views::MouseWatcherListener.
   virtual void MouseMovedOutOfHost() OVERRIDE;
 
-  // views::Widget::Observer.
+  // views::WidgetObserver.
   virtual void OnWidgetClosing(views::Widget* widget) OVERRIDE;
 
   // Close the app window.
   void Close();
 
   // Restore the app window (will result in switching the frame_view back).
   void Restore();
 
   // Returns true if the app controls are being displayed.
   bool IsShowingControls() const;
@@ skipping 14 matching lines @@
   views::Widget* control_widget_;
   // Tracks the mouse and causes the controls to slide back up when it exits.
   views::MouseWatcher mouse_watcher_;
   // Should controls be animated.
   bool animate_controls_;
 
   DISALLOW_COPY_AND_ASSIGN(AppNonClientFrameViewAura);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_APP_NON_CLIENT_FRAME_VIEW_AURA_H_