Use incognito split for ChromeVox and TTS in Guest mode

chrome/browser/speech/tts_extension_loader_chromeos.cc

 // Copyright 2014 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/speech/tts_extension_loader_chromeos.h"
 
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/extensions/component_loader.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 69 matching lines @@
 
 bool TtsExtensionLoaderChromeOs::LoadTtsExtension() {
   if (tts_state_ == TTS_LOADED || tts_state_ == TTS_LOADING)
     return false;
 
   // Load the component extension into this profile.
   VLOG(1) << "Loading TTS component extension.";
   tts_state_ = TTS_LOADING;
   ExtensionService* extension_service = profile_->GetExtensionService();
   DCHECK(extension_service);
-  base::FilePath path =
-      base::FilePath(extension_misc::kSpeechSynthesisExtensionPath);
-  extension_service->component_loader()->Add(IDR_SPEECH_SYNTHESIS_MANIFEST,
-                                             path);
+  extension_service->component_loader()->AddChromeOsSpeechSynthesisExtension();
   return true;
 }
 
 void TtsExtensionLoaderChromeOs::Shutdown() {
   extensions::ExtensionSystem::Get(profile_)->
       event_router()->UnregisterObserver(this);
 }
 
 bool TtsExtensionLoaderChromeOs::IsTtsLoadedInThisProfile() {
   extensions::ExtensionSystem* system =
@@ skipping 20 matching lines @@
 
   if (!IsTtsLoadedInThisProfile())
     return;
 
   if (tts_state_ == TTS_LOADING) {
     VLOG(1) << "TTS component extension loaded, retrying queued utterances.";
     tts_state_ = TTS_LOADED;
     TtsController::GetInstance()->RetrySpeakingQueuedUtterances();
   }
 }