Move extension_test_message_listener to extensions.

chrome/browser/extensions/api/music_manager_private/music_manager_private_browsertest.cc

 // Copyright 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 "chrome/browser/apps/app_browsertest_util.h"
-#include "chrome/browser/extensions/extension_test_message_listener.h"
+#include "extensions/test/extension_test_message_listener.h"
 
 // Supported on all platforms, but on Windows only if RLZ is enabled.
 #if !defined(OS_WIN) || defined(ENABLE_RLZ)
 
 class MusicManagerPrivateTest : public extensions::PlatformAppBrowserTest {
 };
 
 IN_PROC_BROWSER_TEST_F(MusicManagerPrivateTest, DeviceIdValueReturned) {
 #if defined(OS_MACOSX) || defined(OS_LINUX)
   // Note: Some MacOS/Linux trybots seem to run under VMware, which assigns
   //       MAC addresses that are blacklisted. We still want the test
   //       to succeed in that case.
   const char* custom_arg = "device_id_may_be_undefined";
 #else
   const char* custom_arg = NULL;
 #endif
   ASSERT_TRUE(RunPlatformAppTestWithArg(
       "platform_apps/music_manager_private/device_id_value_returned",
       custom_arg))
           << message_;
 }
 
 #endif