Move Singleton and related structs to namespace base

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"
@@ skipping 47 matching lines @@
       extensions::ProcessManager::Get(profile)
           ->GetBackgroundHostForExtension(extension_id);
   host->host_contents()->GetMainFrame()->AddMessageToConsole(
       content::CONSOLE_MESSAGE_LEVEL_WARNING,
       constants::kErrorMissingPauseOrResume);
 }
 
 }  // namespace
 
 TtsExtensionEngine* TtsExtensionEngine::GetInstance() {
-  return Singleton<TtsExtensionEngine>::get();
+  return base::Singleton<TtsExtensionEngine>::get();
 }
 
 void TtsExtensionEngine::GetVoices(content::BrowserContext* browser_context,
     std::vector<VoiceData>* out_voices) {
   Profile* profile = Profile::FromBrowserContext(browser_context);
   EventRouter* event_router = EventRouter::Get(profile);
   DCHECK(event_router);
 
   bool is_offline = (net::NetworkChangeNotifier::GetConnectionType() ==
                      net::NetworkChangeNotifier::CONNECTION_NONE);
@@ skipping 245 matching lines @@
         utterance_id, TTS_EVENT_PAUSE, char_index, std::string());
   } else if (event_type == constants::kEventTypeResume) {
     controller->OnTtsEvent(
         utterance_id, TTS_EVENT_RESUME, char_index, std::string());
   } else {
     EXTENSION_FUNCTION_VALIDATE(false);
   }
 
   return true;
 }