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

ash/system/tray/system_tray.cc

Index: ash/system/tray/system_tray.cc
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index f2c2e06f3fb1393ae8727b091878f6eaef71f5da..d77b65a412fbcadce670f8104fd3113cb916dd16 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -653,11 +653,10 @@ void SystemTray::HideBubbleWithView(const TrayBubbleView* bubble_view) {
   }
 }
 
-bool SystemTray::ClickedOutsideBubble() {
+void SystemTray::ClickedOutsideBubble() {
   if (!system_bubble_ || system_bubble_->is_persistent())
-    return false;
+    return;
   HideBubbleWithView(system_bubble_->bubble_view());
-  return true;
 }
 
 void SystemTray::BubbleViewDestroyed() {