views: Extract Widget observer into its own header file.

chrome/browser/ui/panels/panel_browser_view.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_PANELS_PANEL_BROWSER_VIEW_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_VIEW_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/panels/native_panel.h"
@@ skipping 66 matching lines @@
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Overridden from views::WidgetDelegate:
   virtual void OnDisplayChanged() OVERRIDE;
   virtual void OnWorkAreaChanged() OVERRIDE;
   virtual bool WillProcessWorkAreaChange() const OVERRIDE;
   virtual void OnWindowBeginUserBoundsChange() OVERRIDE;
   virtual void OnWindowEndUserBoundsChange() OVERRIDE;
 
-  // Overridden from views::Widget::Observer
+  // Overridden from views::WidgetObserver:
   virtual void OnWidgetActivationChanged(views::Widget* widget,
                                          bool active) OVERRIDE;
 
   // Overridden from NativePanel:
   virtual void ShowPanel() OVERRIDE;
   virtual void ShowPanelInactive() OVERRIDE;
   virtual gfx::Rect GetPanelBounds() const OVERRIDE;
   virtual void SetPanelBounds(const gfx::Rect& bounds) OVERRIDE;
   virtual void SetPanelBoundsInstantly(const gfx::Rect& bounds) OVERRIDE;
   virtual void ClosePanel() OVERRIDE;
@@ skipping 96 matching lines @@
 
 #if defined(OS_WIN) && !defined(USE_ASH) && !defined(USE_AURA)
   // Used to provide custom taskbar thumbnail for Windows 7 and later.
   scoped_ptr<TaskbarWindowThumbnailerWin> thumbnailer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(PanelBrowserView);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_VIEW_H_