Added support for multiple parameters to Extension API callbacks.

chrome/browser/speech/extension_api/tts_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_extension_api.h"
 
 #include <string>
 
 #include "base/values.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 145 matching lines @@
   controller->SpeakOrEnqueue(utterance);
   return true;
 }
 
 bool ExtensionTtsStopSpeakingFunction::RunImpl() {
   ExtensionTtsController::GetInstance()->Stop();
   return true;
 }
 
 bool ExtensionTtsIsSpeakingFunction::RunImpl() {
-  result_.reset(Value::CreateBooleanValue(
+  SetResult(Value::CreateBooleanValue(
       ExtensionTtsController::GetInstance()->IsSpeaking()));
   return true;
 }
 
 bool ExtensionTtsGetVoicesFunction::RunImpl() {
-  result_.reset(ExtensionTtsController::GetInstance()->GetVoices(profile()));
+  SetResult(ExtensionTtsController::GetInstance()->GetVoices(profile()));
   return true;
 }