Move extension_test_message_listener to extensions.

chrome/browser/extensions/api/audio/audio_apitest.cc

 // Copyright (c) 2013 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/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/extensions/api/audio/audio_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
-#include "chrome/browser/extensions/extension_test_message_listener.h"
 #include "chrome/common/chrome_switches.h"
+#include "extensions/test/extension_test_message_listener.h"
 
 namespace extensions {
 
 class AudioApiTest: public ExtensionApiTest {
  public:
   AudioApiTest() {}
   virtual ~AudioApiTest() {}
 };
 
 #if defined(OS_CHROMEOS)
 IN_PROC_BROWSER_TEST_F(AudioApiTest, Audio) {
   EXPECT_TRUE(RunExtensionTest("audio")) << message_;
 }
 #endif
 
 } // namespace extensions