Fix accessability for web notification tray.

ash/system/tray/system_tray_bubble.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 ASH_SYSTEM_TRAY_SYSTEM_TRAY_BUBBLE_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_BUBBLE_H_
 
 #include "ash/system/tray/tray_bubble_view.h"
 #include "ash/system/user/login_status.h"
 #include "base/base_export.h"
@@ skipping 31 matching lines @@
   // Also creates |bubble_widget_| and sets up animations.
   void InitView(views::View* anchor,
                 TrayBubbleView::InitParams init_params,
                 user::LoginStatus login_status);
 
   // Overridden from TrayBubbleView::Host.
   virtual void BubbleViewDestroyed() OVERRIDE;
   virtual void OnMouseEnteredView() OVERRIDE;
   virtual void OnMouseExitedView() OVERRIDE;
   virtual void OnClickedOutsideView() OVERRIDE;
+  virtual string16 GetAccessibleName() OVERRIDE;
 
   BubbleType bubble_type() const { return bubble_type_; }
   TrayBubbleView* bubble_view() const { return bubble_view_; }
 
   void DestroyItemViews();
   void StartAutoCloseTimer(int seconds);
   void StopAutoCloseTimer();
   void RestartAutoCloseTimer();
   void Close();
   void SetVisible(bool is_visible);
@@ skipping 14 matching lines @@
   int autoclose_delay_;
   base::OneShotTimer<SystemTrayBubble> autoclose_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayBubble);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_BUBBLE_H_