Fix accessability for web notification tray.

ash/system/tray/system_tray.h

Index: ash/system/tray/system_tray.h
diff --git a/ash/system/tray/system_tray.h b/ash/system/tray/system_tray.h
index db34c5d3b98a2823f4a2b08a42a991d26f07ffe8..0dc6679a86f6e8fb601f433c88b5e2ee104a2370 100644
--- a/ash/system/tray/system_tray.h
+++ b/ash/system/tray/system_tray.h
@@ -156,6 +156,7 @@ class ASH_EXPORT SystemTray : public internal::TrayBackgroundView {
   virtual void Initialize() OVERRIDE;
   virtual void SetShelfAlignment(ShelfAlignment alignment) OVERRIDE;
   virtual void AnchorUpdated() OVERRIDE;
+  virtual string16 GetAccessibleName() OVERRIDE;
 
  private:
   friend class internal::SystemTrayBubble;
@@ -192,9 +193,6 @@ class ASH_EXPORT SystemTray : public internal::TrayBackgroundView {
   // Overridden from internal::ActionableView.
   virtual bool PerformAction(const ui::Event& event) OVERRIDE;
 
-  // Overridden from views::View.
-  virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
-
   // Owned items.
   ScopedVector<SystemTrayItem> items_;