views: Extract Widget observer into its own header file.

ui/views/bubble/bubble_delegate.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 UI_VIEWS_BUBBLE_BUBBLE_DELEGATE_H_
 #define UI_VIEWS_BUBBLE_BUBBLE_DELEGATE_H_
 
 #include "base/gtest_prod_util.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/views/bubble/bubble_border.h"
-#include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
+#include "ui/views/widget/widget_observer.h"
 
 namespace ui {
 class SlideAnimation;
-}  // namespace ui
+}
 
 namespace views {
 
 class BubbleFrameView;
 
 // BubbleDelegateView creates frame and client views for bubble Widgets.
 // BubbleDelegateView itself is the client's contents view.
 //
 ///////////////////////////////////////////////////////////////////////////////
 class VIEWS_EXPORT BubbleDelegateView : public WidgetDelegateView,
                                         public ui::AnimationDelegate,
-                                        public Widget::Observer {
+                                        public WidgetObserver {
  public:
   // The default bubble background color.
   static const SkColor kBackgroundColor;
 
   BubbleDelegateView();
   BubbleDelegateView(View* anchor_view,
                      BubbleBorder::ArrowLocation arrow_location);
   virtual ~BubbleDelegateView();
 
   // Create and initialize the bubble Widget(s) with proper bounds.
   static Widget* CreateBubble(BubbleDelegateView* bubble_delegate);
 
   // WidgetDelegate overrides:
   virtual View* GetInitiallyFocusedView() OVERRIDE;
   virtual BubbleDelegateView* AsBubbleDelegate() OVERRIDE;
   virtual View* GetContentsView() OVERRIDE;
-  virtual NonClientFrameView* CreateNonClientFrameView(
-      views::Widget* widget) OVERRIDE;
+  virtual NonClientFrameView* CreateNonClientFrameView(Widget* widget) OVERRIDE;
 
-  // Widget::Observer overrides:
+  // WidgetObserver overrides:
   virtual void OnWidgetClosing(Widget* widget) OVERRIDE;
   virtual void OnWidgetVisibilityChanged(Widget* widget, bool visible) OVERRIDE;
   virtual void OnWidgetActivationChanged(Widget* widget, bool active) OVERRIDE;
   virtual void OnWidgetMoved(Widget* widget) OVERRIDE;
 
   bool close_on_esc() const { return close_on_esc_; }
   void set_close_on_esc(bool close_on_esc) { close_on_esc_ = close_on_esc; }
 
   bool close_on_deactivate() const { return close_on_deactivate_; }
   void set_close_on_deactivate(bool close_on_deactivate) {
@@ skipping 111 matching lines @@
 
   // Parent native window of the bubble.
   gfx::NativeView parent_window_;
 
   DISALLOW_COPY_AND_ASSIGN(BubbleDelegateView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_BUBBLE_DELEGATE_H_