Add base::RunLoop and update ui_test_utils to use it to reduce flakiness

chrome_frame/test/chrome_frame_automation_mock.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 "chrome_frame/test/chrome_frame_automation_mock.h"
 #include "chrome_frame/test/chrome_frame_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 const base::TimeDelta kLongWaitTimeout = base::TimeDelta::FromSeconds(25);
 
 TEST(ChromeFrame, Launch) {
   MessageLoopForUI loop;
   AutomationMockLaunch mock_launch(&loop,
                                    kLongWaitTimeout.InMilliseconds());
 
   loop.PostDelayedTask(FROM_HERE, MessageLoop::QuitClosure(), kLongWaitTimeout);
 
   mock_launch.Navigate("about:blank");
-  loop.RunWithDispatcher(NULL);
+  base::RunLoop run_loop(NULL);
+  run_loop.Run();
   EXPECT_TRUE(mock_launch.launch_result());
 }
 
 TEST(ChromeFrame, Navigate) {
   MessageLoopForUI loop;
   AutomationMockNavigate mock_navigate(&loop,
                                        kLongWaitTimeout.InMilliseconds());
 
   loop.PostDelayedTask(FROM_HERE, MessageLoop::QuitClosure(), kLongWaitTimeout);
 
   mock_navigate.NavigateRelativeFile(L"postmessage_basic_frame.html");
-  loop.RunWithDispatcher(NULL);
+  base::RunLoop run_loop(NULL);
+  run_loop.Run();
   EXPECT_FALSE(mock_navigate.navigation_result());
 }
 
 TEST(ChromeFrame, PostMessage) {
   MessageLoopForUI loop;
   AutomationMockPostMessage mock_postmessage(&loop,
                                              kLongWaitTimeout.InMilliseconds());
 
   loop.PostDelayedTask(FROM_HERE, MessageLoop::QuitClosure(), kLongWaitTimeout);
 
   mock_postmessage.NavigateRelativeFile(L"postmessage_basic_frame.html");
-  loop.RunWithDispatcher(NULL);
+  base::RunLoop run_loop(NULL);
+  run_loop.Run();
   EXPECT_FALSE(mock_postmessage.postmessage_result());
 }
 
 TEST(ChromeFrame, RequestStart) {
   MessageLoopForUI loop;
   AutomationMockHostNetworkRequestStart mock_request_start(
       &loop, kLongWaitTimeout.InMilliseconds());
 
   loop.PostDelayedTask(FROM_HERE, MessageLoop::QuitClosure(), kLongWaitTimeout);
 
   mock_request_start.NavigateRelative(L"postmessage_basic_frame.html");
-  loop.RunWithDispatcher(NULL);
+  base::RunLoop run_loop(NULL);
+  run_loop.Run();
   EXPECT_TRUE(mock_request_start.request_start_result());
 }