Call scoped_refptr<T>::get() rather than relying on implicit "operator T*"

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 50 matching lines @@
 void GetExtensionVoices(Profile* profile, std::vector<VoiceData>* out_voices) {
   ExtensionService* service = profile->GetExtensionService();
   DCHECK(service);
   EventRouter* event_router =
       ExtensionSystem::Get(profile)->event_router();
   DCHECK(event_router);
 
   const ExtensionSet* extensions = service->extensions();
   ExtensionSet::const_iterator iter;
   for (iter = extensions->begin(); iter != extensions->end(); ++iter) {
-    const Extension* extension = *iter;
+    const Extension* extension = iter->get();
 
     if (!event_router->ExtensionHasEventListener(
             extension->id(), tts_engine_events::kOnSpeak) ||
         !event_router->ExtensionHasEventListener(
             extension->id(), tts_engine_events::kOnStop)) {
       continue;
     }
 
     const std::vector<extensions::TtsVoice>* tts_voices =
         extensions::TtsVoice::GetTtsVoices(extension);
@@ skipping 170 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;
 }