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

ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc

Index: ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
diff --git a/ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc b/ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
index f04b16efee7fd96e3fb5a421054e264e68746df3..93cefc8ea48c00510279a0352e2751830aae49fa 100644
--- a/ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
+++ b/ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc
@@ -84,9 +84,7 @@ void VirtualKeyboardTray::HideBubbleWithView(
     const views::TrayBubbleView* bubble_view) {
 }
 
-bool VirtualKeyboardTray::ClickedOutsideBubble() {
-  return false;
-}
+void VirtualKeyboardTray::ClickedOutsideBubble() {}
 
 bool VirtualKeyboardTray::PerformAction(const ui::Event& event) {
   Shell::GetInstance()->keyboard_ui()->Show();