Do not activate system tray bubble by default

ash/aura/key_event_watcher_aura.cc

 // Copyright 2016 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/wm/maximize_mode/maximize_mode_event_handler_aura.h"
+#include "ash/aura/key_event_watcher_aura.h"
 
 #include "ash/shell.h"
 #include "ui/events/event.h"
 
 namespace ash {
-namespace wm {
 
-MaximizeModeEventHandlerAura::MaximizeModeEventHandlerAura() {
+KeyEventWatcherAura::KeyEventWatcherAura() {
   Shell::GetInstance()->AddPreTargetHandler(this);
 }
 
-MaximizeModeEventHandlerAura::~MaximizeModeEventHandlerAura() {
+KeyEventWatcherAura::~KeyEventWatcherAura() {
   Shell::GetInstance()->RemovePreTargetHandler(this);
 }
 
-void MaximizeModeEventHandlerAura::OnTouchEvent(ui::TouchEvent* event) {
-  if (ToggleFullscreen(*event))
+void KeyEventWatcherAura::OnKeyEvent(ui::KeyEvent* event) {
+  if (HandleKeyEvent(*event))
     event->StopPropagation();
 }
 
-}  // namespace wm
 }  // namespace ash