Use base::MessageLoop in more files.

chrome/browser/speech/extension_api/tts_extension_apitest.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 "base/bind.h"
 #include "base/command_line.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/speech/extension_api/tts_extension_api.h"
@@ skipping 45 matching lines @@
 
   MOCK_METHOD0(IsSpeaking, bool(void));
 
   MOCK_METHOD1(GetVoices, void(std::vector<VoiceData>*));
 
   void SetErrorToEpicFail() {
     set_error("epic fail");
   }
 
   void SendEndEventOnSavedUtteranceId() {
-    MessageLoop::current()->PostDelayedTask(
+    base::MessageLoop::current()->PostDelayedTask(
         FROM_HERE, base::Bind(
             &MockTtsPlatformImpl::SendEvent,
             ptr_factory_.GetWeakPtr(),
             false, g_saved_utterance_id, TTS_EVENT_END, 0, std::string()),
         base::TimeDelta());
   }
 
   void SendEndEvent(int utterance_id,
                     const std::string& utterance,
                     const std::string& lang,
@@ skipping 295 matching lines @@
   EXPECT_CALL(mock_platform_impl_, StopSpeaking())
       .WillRepeatedly(Return(true));
 
   ASSERT_TRUE(RunExtensionTest("tts_engine/lang_matching")) << message_;
 }
 
 // http://crbug.com/122474
 IN_PROC_BROWSER_TEST_F(TtsApiTest, EngineApi) {
   ASSERT_TRUE(RunExtensionTest("tts_engine/engine_api")) << message_;
 }