mash: Use ChromeNativeAppWindowViewsAuraAsh; workaround crashes.

chrome/browser/ui/views/apps/chrome_app_window_client_views_chromeos.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 "chrome/browser/ui/apps/chrome_app_window_client.h"
 
 #include "chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.h"
-#include "services/service_manager/runner/common/client_util.h"
 
 // static
 extensions::NativeAppWindow* ChromeAppWindowClient::CreateNativeAppWindowImpl(
     extensions::AppWindow* app_window,
     const extensions::AppWindow::CreateParams& params) {
-  // TODO: Mash should use ChromeNativeAppWindowViewsAuraAsh, but
-  // it can't because of dependencies on ash. http://crbug.com/679028.
-  ChromeNativeAppWindowViewsAura* window =
-      service_manager::ServiceManagerIsRemote()
-          ? new ChromeNativeAppWindowViewsAura
-          : new ChromeNativeAppWindowViewsAuraAsh;
+  ChromeNativeAppWindowViewsAuraAsh* window =
+      new ChromeNativeAppWindowViewsAuraAsh;
   window->Init(app_window, params);
   return window;
 }