Move extension_test_message_listener to extensions.

chrome/browser/extensions/api/processes/processes_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/command_line.h"
 #include "chrome/browser/extensions/extension_apitest.h"
-#include "chrome/browser/extensions/extension_test_message_listener.h"
 #include "chrome/browser/task_manager/task_manager.h"
 #include "chrome/browser/task_manager/task_manager_browsertest_util.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "extensions/common/switches.h"
+#include "extensions/test/extension_test_message_listener.h"
 
 // Test is flaky: http://crbug.com/346990
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, DISABLED_Processes) {
   ASSERT_TRUE(RunExtensionTest("processes/api")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ProcessesVsTaskManager) {
   // Ensure task manager is not yet updating
   TaskManagerModel* model = TaskManager::GetInstance()->model();
   EXPECT_EQ(0, model->update_requests_);
@@ skipping 12 matching lines @@
   // Now show the task manager and wait for it to be ready
   chrome::ShowTaskManager(browser());
 
   EXPECT_EQ(2, model->update_requests_);
   EXPECT_EQ(TaskManagerModel::TASK_PENDING, model->update_state_);
 
   // Unload the extension and check that listener count decreases
   UnloadExtension(last_loaded_extension_id());
   EXPECT_EQ(1, model->update_requests_);
 }