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

chrome/browser/download/save_page_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/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
@@ skipping 116 matching lines @@
     // Query the history system.
     ChromeDownloadManagerDelegate* delegate =
       static_cast<ChromeDownloadManagerDelegate*>(
           GetDownloadManager()->GetDelegate());
     delegate->download_history()->Load(
         base::Bind(&SavePageBrowserTest::OnQueryDownloadEntriesComplete,
                    base::Unretained(this)));
 
     // Run message loop until a quit message is sent from
     // OnQueryDownloadEntriesComplete().
-    ui_test_utils::RunMessageLoop();
+    content::RunMessageLoop();
   }
 
   void OnQueryDownloadEntriesComplete(
       std::vector<DownloadPersistentStoreInfo>* entries) {
     history_entries_ = *entries;
 
     // Indicate thet we have received the history and can continue.
     MessageLoopForUI::current()->Quit();
   }
 
@@ skipping 260 matching lines @@
         content::NotificationService::AllSources());
   chrome::SavePage(browser());
   observer.Wait();
   CheckDownloadHistory(url, full_file_name, -1);
 
   EXPECT_TRUE(file_util::PathExists(full_file_name));
   int64 actual_file_size = -1;
   EXPECT_TRUE(file_util::GetFileSize(full_file_name, &actual_file_size));
   EXPECT_LE(kFileSizeMin, actual_file_size);
 }