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

chrome/browser/printing/printing_layout_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/file_path.h"
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/process_util.h"
@@ skipping 49 matching lines @@
     command_line->AppendSwitchPath(switches::kDebugPrint, emf_path_);
   }
 
  protected:
   void PrintNowTab() {
     registrar_.Add(this, chrome::NOTIFICATION_PRINT_JOB_EVENT,
                    content::NotificationService::AllSources());
 
     TabContents* tab = chrome::GetActiveTabContents(browser());
     tab->print_view_manager()->PrintNow();
-    ui_test_utils::RunMessageLoop();
+    content::RunMessageLoop();
     registrar_.RemoveAll();
   }
 
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) {
     DCHECK(type == chrome::NOTIFICATION_PRINT_JOB_EVENT);
     switch (content::Details<printing::JobEventDetails>(details)->type()) {
       case printing::JobEventDetails::JOB_DONE: {
         // Succeeded.
@@ skipping 374 matching lines @@
 
     // Force a navigation elsewhere to verify that it's fine with it.
     url = test_server()->GetURL("files/printing/test1.html");
     ui_test_utils::NavigateToURL(browser(), url);
   }
   chrome::CloseWindow(browser());
   ui_test_utils::RunAllPendingInMessageLoop();
 
   EXPECT_EQ(0., CompareWithResult(L"iframe")) << L"iframe";
 }