Re-factor Ash Message Center code part 2/4

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 4afbc3829267b51727ab4f312dc999f1f173beab..760c527dfb9ebd27aadfdd8d849d4ced2d923595 100644
--- a/ash/system/tray/system_tray.h
+++ b/ash/system/tray/system_tray.h
@@ -159,6 +159,8 @@ class ASH_EXPORT SystemTray : public internal::TrayBackgroundView {
   virtual void SetShelfAlignment(ShelfAlignment alignment) OVERRIDE;
   virtual void AnchorUpdated() OVERRIDE;
   virtual string16 GetAccessibleName() OVERRIDE;
+  virtual void HideBubbleWithView(const TrayBubbleView* bubble_view) OVERRIDE;
+  virtual bool ClickedOutsideBubble() OVERRIDE;
 
  private:
   friend class internal::SystemTrayBubble;
@@ -170,11 +172,6 @@ class ASH_EXPORT SystemTray : public internal::TrayBackgroundView {
   // Resets |notification_bubble_| and clears any related state.
   void DestroyNotificationBubble();
 
-  // Called when the widget associated with |bubble| closes. |bubble| should
-  // always == |bubble_|. This triggers destroying |bubble_| and hiding the
-  // launcher if necessary.
-  void RemoveBubble(internal::SystemTrayBubble* bubble);
-
   const ScopedVector<SystemTrayItem>& items() const { return items_; }
 
   // Calculates the x-offset for the item in the tray. Returns -1 if its tray