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

chrome/browser/printing/cloud_print/test/cloud_print_proxy_process_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.
 
 // Create a service process that uses a Mock to respond to the browser in order
 // to test launching the browser using the cloud print policy check command
 // line switch.
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 318 matching lines @@
   class WindowedChannelConnectionObserver {
    public:
     WindowedChannelConnectionObserver()
         : seen_(false),
           running_(false) { }
 
     void Wait() {
       if (seen_)
         return;
       running_ = true;
-      ui_test_utils::RunMessageLoop();
+      content::RunMessageLoop();
     }
 
     void Notify() {
       seen_ = true;
       if (running_)
         MessageLoopForUI::current()->Quit();
     }
 
    private:
     bool seen_;
@@ skipping 183 matching lines @@
   // No expectations on run_loop being true here; that would be a race
   // condition.
   if (run_loop)
     MessageLoop::current()->Run();
 
   EXPECT_EQ("", prefs->GetString(prefs::kCloudPrintEmail));
 
   ShutdownAndWaitForExitWithTimeout(handle);
   profile_manager.DeleteTestingProfile("StartBrowserWithPolicy");
 }