Move Extension into extensions namespace

chrome/browser/speech/extension_api/tts_engine_extension_api.cc

 // Copyright (c) 2012 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/extension_api/tts_engine_extension_api.h"
 
 #include <string>
 
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/speech/extension_api/tts_extension_api_constants.h"
 #include "chrome/browser/speech/extension_api/tts_extension_api_controller.h"
 #include "chrome/common/extensions/extension.h"
 
+using extensions::Extension;
+
 namespace constants = tts_extension_api_constants;
 
 namespace events {
 const char kOnSpeak[] = "ttsEngine.onSpeak";
 const char kOnStop[] = "ttsEngine.onStop";
 };  // namespace events
 
 void GetExtensionVoices(Profile* profile, ListValue* result_voices) {
   ExtensionService* service = profile->GetExtensionService();
   DCHECK(service);
@@ skipping 231 matching lines @@
     std::string error_message;
     event->GetString(constants::kErrorMessageKey, &error_message);
     controller->OnTtsEvent(
         utterance_id, TTS_EVENT_ERROR, char_index, error_message);
   } else {
     EXTENSION_FUNCTION_VALIDATE(false);
   }
 
   return true;
 }