Move extension_test_message_listener to extensions.

chrome/browser/extensions/extension_context_menu_browsertest.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/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
-#include "chrome/browser/extensions/extension_test_message_listener.h"
 #include "chrome/browser/extensions/lazy_background_page_test_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 #include "chrome/browser/renderer_context_menu/render_view_context_menu_test_util.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/common/context_menu_params.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/process_manager.h"
 #include "extensions/browser/test_management_policy.h"
 #include "extensions/common/extension_set.h"
+#include "extensions/test/extension_test_message_listener.h"
 #include "net/dns/mock_host_resolver.h"
 #include "ui/base/models/menu_model.h"
 
 using content::WebContents;
 using extensions::ContextMenuMatcher;
 using extensions::MenuItem;
 using ui::MenuModel;
 
 class ExtensionContextMenuBrowserTest : public ExtensionBrowserTest {
  public:
@@ skipping 575 matching lines @@
   ASSERT_TRUE(LoadContextMenuExtensionIncognito("incognito"));
 
   // Wait for the extension's processes to tell us they've created an item.
   ASSERT_TRUE(created.WaitUntilSatisfied());
   ASSERT_TRUE(created_incognito.WaitUntilSatisfied());
   ASSERT_EQ(2u, GetItems().size());
 
   browser()->profile()->DestroyOffTheRecordProfile();
   ASSERT_EQ(1u, GetItems().size());
 }