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

ash/system/overview/overview_button_tray.cc

 // Copyright 2014 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.
 
 #include "ash/system/overview/overview_button_tray.h"
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/shelf/shelf_util.h"
 #include "ash/shell.h"
@@ skipping 66 matching lines @@
 }
 
 void OverviewButtonTray::OnMaximizeModeEnded() {
   UpdateIconVisibility();
 }
 
 void OverviewButtonTray::OnOverviewModeEnded() {
   SetDrawBackgroundAsActive(false);
 }
 
-bool OverviewButtonTray::ClickedOutsideBubble() {
-  // This class has no bubbles dismiss, but acknowledge that the message was
-  // handled.
-  return true;
-}
+void OverviewButtonTray::ClickedOutsideBubble() {}
 
 base::string16 OverviewButtonTray::GetAccessibleNameForTray() {
   return l10n_util::GetStringUTF16(IDS_ASH_OVERVIEW_BUTTON_ACCESSIBLE_NAME);
 }
 
 void OverviewButtonTray::HideBubbleWithView(
     const views::TrayBubbleView* bubble_view) {
   // This class has no bubbles to hide.
 }
 
@@ skipping 34 matching lines @@
       shell->maximize_mode_controller()->IsMaximizeModeWindowManagerEnabled() &&
       session_state_delegate->IsActiveUserSessionStarted() &&
       !session_state_delegate->IsScreenLocked() &&
       session_state_delegate->GetSessionState() ==
           SessionStateDelegate::SESSION_STATE_ACTIVE &&
       shell->system_tray_delegate()->GetUserLoginStatus() !=
           user::LOGGED_IN_KIOSK_APP);
 }
 
 }  // namespace ash