views: Extract Widget observer into its own header file.

chrome/browser/ui/panels/panel_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_VIEW_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_VIEW_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/panels/native_panel.h"
 #include "ui/base/animation/animation_delegate.h"
-#include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
+#include "ui/views/widget/widget_observer.h"
 
 class Panel;
 class PanelBoundsAnimation;
 class PanelFrameView;
 class TaskbarWindowThumbnailerWin;
 
 namespace views {
 class WebView;
 }
 
 class PanelView : public NativePanel,
-                  public views::Widget::Observer,
+                  public views::WidgetObserver,
                   public views::WidgetDelegateView,
                   public ui::AnimationDelegate {
  public:
   // The size of inside area used for mouse resizing.
   static const int kResizeInsideBoundsSize = 5;
 
   PanelView(Panel* panel, const gfx::Rect& bounds);
   virtual ~PanelView();
 
   // Overridden from NativePanel:
@@ skipping 86 matching lines @@
   virtual void DeleteDelegate() OVERRIDE;
   virtual void OnWindowBeginUserBoundsChange() OVERRIDE;
   virtual void OnWindowEndUserBoundsChange() OVERRIDE;
 
   // Overridden from views::View:
   virtual void Layout() OVERRIDE;
   virtual gfx::Size GetMinimumSize() OVERRIDE;
   virtual gfx::Size GetMaximumSize() OVERRIDE;
   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
 
-  // Overridden from views::Widget::Observer
+  // Overridden from views::WidgetObserver:
   virtual void OnWidgetActivationChanged(views::Widget* widget,
                                          bool active) OVERRIDE;
 
   // Overridden from AnimationDelegate:
   virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
 
   void UpdateLoadingAnimations(bool should_animate);
   void UpdateWindowTitle();
   void UpdateWindowIcon();
@@ skipping 51 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(PanelView);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_VIEW_H_