ash: Fix blurry app list bubble border.

ui/app_list/app_list_bubble_border.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_APP_LIST_APP_LIST_BUBBLE_BORDER_H_
 #define UI_APP_LIST_APP_LIST_BUBBLE_BORDER_H_
 
 #include "base/basictypes.h"
 #include "ui/gfx/shadow_value.h"
 #include "ui/views/bubble/bubble_border_2.h"
 
 namespace app_list {
 
 // A class to paint bubble border and background.
 class AppListBubbleBorder : public views::BubbleBorder2 {
  public:
   AppListBubbleBorder(views::View* app_list_view,
                       views::View* search_box_view);
   virtual ~AppListBubbleBorder();
 
  private:
-  // views::ImagelessBubbleBorder overrides:
-  void PaintBackground(gfx::Canvas* canvas,
-                       const gfx::Rect& bounds) const;
+  // views::BubbleBorder2 overrides:
+  virtual void PaintBackground(gfx::Canvas* canvas,
+                               const gfx::Rect& bounds) const OVERRIDE;
 
   // AppListView hosted inside this bubble.
   const views::View* app_list_view_;  // Owned by views hierarchy.
 
   // Children view of AppListView that needs to paint background.
   const views::View* search_box_view_;  // Owned by views hierarchy.
 
   DISALLOW_COPY_AND_ASSIGN(AppListBubbleBorder);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APP_LIST_BUBBLE_BORDER_H_