mash: Avoid KeyboardDrivenEventRewriter::GetInstance crash.

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

 // Copyright (c) 2013 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 "chrome/browser/chromeos/chrome_browser_main_chromeos.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 723 matching lines @@
     system::InputDeviceSettings::Get()->InitTouchDevicesStatusFromLocalPrefs();
 
     // These are dependent on the ash::Shell singleton already having been
     // initialized. Consequently, these cannot be used when running as a mus
     // client.
     // TODO(oshima): Remove ash dependency in LoginLockStateNotifier.
     // crbug.com/408832.
     login_lock_state_notifier_.reset(new LoginLockStateNotifier);
     data_promo_notification_.reset(new DataPromoNotification());
 
+    // TODO(mash): Support EventRewriterController; see crbug.com/647781
     keyboard_event_rewriters_.reset(new EventRewriterController());
     keyboard_event_rewriters_->AddEventRewriter(
         std::unique_ptr<ui::EventRewriter>(new KeyboardDrivenEventRewriter()));
     keyboard_event_rewriters_->AddEventRewriter(
         std::unique_ptr<ui::EventRewriter>(new SpokenFeedbackEventRewriter()));
     keyboard_event_rewriters_->AddEventRewriter(
         std::unique_ptr<ui::EventRewriter>(new EventRewriter(
             ash::Shell::GetInstance()->sticky_keys_controller())));
     keyboard_event_rewriters_->Init();
   }
@@ skipping 125 matching lines @@
   // Destroy DBus services immediately after threads are stopped.
   dbus_services_.reset();
 
   ChromeBrowserMainPartsLinux::PostDestroyThreads();
 
   // Destroy DeviceSettingsService after g_browser_process.
   DeviceSettingsService::Shutdown();
 }
 
 }  //  namespace chromeos