mash: Close the system tray bubble on click outside its bounds

ash/system/tray/tray_background_view.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_TRAY_BACKGROUND_VIEW_H_
 #define ASH_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 84 matching lines @@
   virtual base::string16 GetAccessibleNameForTray() = 0;
 
   // Called when the bubble is resized.
   virtual void BubbleResized(const views::TrayBubbleView* bubble_view) {}
 
   // Hides the bubble associated with |bubble_view|. Called when the widget
   // is closed.
   virtual void HideBubbleWithView(const views::TrayBubbleView* bubble_view) = 0;
 
   // Called by the bubble wrapper when a click event occurs outside the bubble.
-  // May close the bubble. Returns true if the event is handled.
-  virtual bool ClickedOutsideBubble() = 0;
+  // May close the bubble.
+  virtual void ClickedOutsideBubble() = 0;
 
   // Sets |contents| as a child.
   void SetContents(views::View* contents);
 
   // Creates and sets contents background to |background_|.
   void SetContentsBackground();
 
   // Sets whether the tray paints a background. Default is true, but is set to
   // false if a window overlaps the shelf.
   void SetPaintsBackground(bool value,
@@ skipping 75 matching lines @@
 
   std::unique_ptr<TrayWidgetObserver> widget_observer_;
   std::unique_ptr<TrayEventFilter> tray_event_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBackgroundView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_