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

chrome/browser/chromeos/login/screen_locker_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/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/browser/chromeos/cros/cros_in_process_browser_test.h"
 #include "chrome/browser/chromeos/cros/mock_network_library.h"
 #include "chrome/browser/chromeos/login/mock_authenticator.h"
@@ skipping 43 matching lines @@
       MessageLoop::current()->Quit();
   }
 
   // Wait until the two conditions are met.
   void Wait(bool locker_state, bool fullscreen) {
     running_ = true;
     scoped_ptr<chromeos::test::ScreenLockerTester>
         tester(chromeos::ScreenLocker::GetTester());
     while (tester->IsLocked() != locker_state ||
            browser_->window()->IsFullscreen() != fullscreen) {
-      ui_test_utils::RunMessageLoop();
+      content::RunMessageLoop();
     }
     // Make sure all pending tasks are executed.
     ui_test_utils::RunAllPendingInMessageLoop();
     running_ = false;
   }
 
  private:
   Browser* browser_;
   content::NotificationRegistrar registrar_;
 
@@ skipping 170 matching lines @@
   ui_test_utils::RunAllPendingInMessageLoop();
   EXPECT_EQ("", tester->GetPassword());
 
   // Close the locker to match expectations.
   ScreenLocker::Hide();
   ui_test_utils::RunAllPendingInMessageLoop();
   EXPECT_FALSE(tester->IsLocked());
 }
 
 }  // namespace chromeos