mash: Fix crashes during chrome teardown.

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 794 matching lines @@
 
   // SystemKeyEventListener::Shutdown() is always safe to call,
   // even if Initialize() wasn't called.
   SystemKeyEventListener::Shutdown();
 #endif
 
   // Detach D-Bus clients before DBusThreadManager is shut down.
   power_button_observer_.reset();
   idle_action_warning_observer_.reset();
 
-  MagnificationManager::Shutdown();
+  if (!IsRunningAsMusClient())
+    MagnificationManager::Shutdown();
 
   media::SoundsManager::Shutdown();
 
   system::StatisticsProvider::GetInstance()->Shutdown();
 
   // Let the UserManager and WallpaperManager unregister itself as an observer
   // of the CrosSettings singleton before it is destroyed. This also ensures
   // that the UserManager has no URLRequest pending (see
   // http://crbug.com/276659).
   g_browser_process->platform_part()->user_manager()->Shutdown();
@@ skipping 16 matching lines @@
   // Give BrowserPolicyConnectorChromeOS a chance to unregister any observers
   // on services that are going to be deleted later but before its Shutdown()
   // is called.
   g_browser_process->platform_part()->browser_policy_connector_chromeos()->
       PreShutdown();
 
   // We first call PostMainMessageLoopRun and then destroy UserManager, because
   // Ash needs to be closed before UserManager is destroyed.
   ChromeBrowserMainPartsLinux::PostMainMessageLoopRun();
 
-  AccessibilityManager::Shutdown();
+  if (!IsRunningAsMusClient())
+    AccessibilityManager::Shutdown();
 
   input_method::Shutdown();
 
   // Stops all in-flight OAuth2 token fetchers before the IO thread stops.
   DeviceOAuth2TokenServiceFactory::Shutdown();
 
   // Shutdown after PostMainMessageLoopRun() which should destroy all observers.
   CrasAudioHandler::Shutdown();
 
   quirks::QuirksManager::Shutdown();
@@ skipping 13 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