Use incognito split for ChromeVox and TTS in Guest mode

chrome/browser/chromeos/accessibility/accessibility_manager.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/accessibility/accessibility_manager.h"
 
 #include "ash/audio/sounds.h"
 #include "ash/autoclick/autoclick_controller.h"
 #include "ash/high_contrast/high_contrast_controller.h"
 #include "ash/metrics/user_metrics_recorder.h"
@@ skipping 138 matching lines @@
   std::string extension_id_;
   int render_process_id_;
   int render_view_id_;
   std::queue<extensions::ExtensionResource> resources_;
 };
 
 void LoadChromeVoxExtension(Profile* profile,
                             RenderViewHost* render_view_host) {
   ExtensionService* extension_service =
       extensions::ExtensionSystem::Get(profile)->extension_service();
-  base::FilePath path = GetChromeVoxPath();
   std::string extension_id =
-      extension_service->component_loader()->Add(IDR_CHROMEVOX_MANIFEST,
-                                                 path);
+      extension_service->component_loader()->AddChromeVoxExtension();
   if (render_view_host) {
     ExtensionService* extension_service =
         extensions::ExtensionSystem::Get(profile)->extension_service();
     const extensions::Extension* extension =
         extension_service->extensions()->GetByID(extension_id);
 
     // Set a flag to tell ChromeVox that it's just been enabled,
     // so that it won't interrupt our speech feedback enabled message.
     ExtensionMsg_ExecuteCode_Params params;
     params.request_id = 0;
@@ skipping 778 matching lines @@
 
 void AccessibilityManager::PostUnloadChromeVox(Profile* profile) {
   // Do any teardown work needed immediately after ChromeVox actually unloads.
   if (system_sounds_enabled_) {
     ash::PlaySystemSound(SOUND_SPOKEN_FEEDBACK_DISABLED,
                          false /* honor_spoken_feedback */);
   }
 }
 
 }  // namespace chromeos