Convert JsonWriter::Write to taking a const ref for the in-param

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 173 matching lines @@
   // rather than directly by the client that requested the speech.
   if (!options->HasKey(constants::kVoiceNameKey))
     options->SetString(constants::kVoiceNameKey, voice.name);
   if (!options->HasKey(constants::kLangKey))
     options->SetString(constants::kLangKey, voice.lang);
 
   args->Append(options.release());
   args->AppendInteger(utterance->id());
 
   std::string json;
-  base::JSONWriter::Write(args.get(), &json);
+  base::JSONWriter::Write(*args, &json);
 
   scoped_ptr<extensions::Event> event(new extensions::Event(
       tts_engine_events::kOnSpeak, args.Pass()));
   Profile* profile = Profile::FromBrowserContext(utterance->browser_context());
   event->restrict_to_browser_context = profile;
   EventRouter::Get(profile)
       ->DispatchEventToExtension(utterance->extension_id(), event.Pass());
 }
 
 void TtsExtensionEngine::Stop(Utterance* utterance) {
@@ skipping 116 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;
 }