Move ui_test_utils::RunMessageLoop to test_utils so that it can be reused by content_browsertests.

chrome/browser/extensions/convert_web_app_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 <string>
 
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/chrome_notification_types.h"
@@ skipping 47 matching lines @@
   registrar.Add(this, chrome::NOTIFICATION_EXTENSION_INSTALLED,
                 content::NotificationService::AllSources());
 
   expected_extension_id_ = "fnpgoaochgbdfjndakichfafiocjjpmm";
   ui_test_utils::NavigateToURL(
       browser(),
       test_server()->GetURL(
           "files/extensions/convert_web_app/application.html"));
 
   if (!installed_extension_)
-    ui_test_utils::RunMessageLoop();
+    content::RunMessageLoop();
 
   EXPECT_TRUE(installed_extension_);
   EXPECT_TRUE(installed_extension_->is_hosted_app());
   EXPECT_EQ("Test application", installed_extension_->name());
   EXPECT_EQ("the description is", installed_extension_->description());
   EXPECT_EQ(extension_misc::LAUNCH_PANEL,
             installed_extension_->launch_container());
 
   ASSERT_EQ(2u, installed_extension_->GetActivePermissions()->apis().size());
   EXPECT_TRUE(installed_extension_->HasAPIPermission(
       APIPermission::kGeolocation));
   EXPECT_TRUE(installed_extension_->HasAPIPermission(
       APIPermission::kNotification));
 
   ASSERT_EQ(3u, installed_extension_->icons().map().size());
   EXPECT_EQ("icons/16.png", installed_extension_->icons().Get(
       16, ExtensionIconSet::MATCH_EXACTLY));
   EXPECT_EQ("icons/48.png", installed_extension_->icons().Get(
       48, ExtensionIconSet::MATCH_EXACTLY));
   EXPECT_EQ("icons/128.png", installed_extension_->icons().Get(
       128, ExtensionIconSet::MATCH_EXACTLY));
 }