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

chrome/browser/safe_browsing/safe_browsing_service_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.
 //
 // This test creates a safebrowsing service using test safebrowsing database
 // and a test protocol manager. It is used to test logics in safebrowsing
 // service.
 
 #include <algorithm>
 
@@ skipping 504 matching lines @@
 
   int GetResult() {
     return result_;
   }
 
   void CheckDownloadUrl(const std::vector<GURL>& url_chain) {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&TestSBClient::CheckDownloadUrlOnIOThread,
                    this, url_chain));
-    ui_test_utils::RunMessageLoop();  // Will stop in OnDownloadUrlCheckResult.
+    content::RunMessageLoop();  // Will stop in OnDownloadUrlCheckResult.
   }
 
   void CheckDownloadHash(const std::string& full_hash) {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&TestSBClient::CheckDownloadHashOnIOThread,
                    this, full_hash));
-    ui_test_utils::RunMessageLoop();  // Will stop in OnDownloadHashCheckResult.
+    content::RunMessageLoop();  // Will stop in OnDownloadHashCheckResult.
   }
 
  private:
   friend class base::RefCountedThreadSafe<TestSBClient>;
   virtual ~TestSBClient() {}
 
   void CheckDownloadUrlOnIOThread(const std::vector<GURL>& url_chain) {
     safe_browsing_service_->CheckDownloadUrl(url_chain, this);
   }
 
@@ skipping 332 matching lines @@
 // save cookies.
 IN_PROC_BROWSER_TEST_F(SafeBrowsingServiceCookieTest, TestSBUpdateCookies) {
   content::WindowedNotificationObserver observer(
       chrome::NOTIFICATION_SAFE_BROWSING_UPDATE_COMPLETE,
       content::Source<SafeBrowsingService>(sb_service_.get()));
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&SafeBrowsingServiceCookieTest::ForceUpdate, this));
   observer.Wait();
 }