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

chrome_frame/test/chrome_frame_automation_mock.cc

Index: chrome_frame/test/chrome_frame_automation_mock.cc
diff --git a/chrome_frame/test/chrome_frame_automation_mock.cc b/chrome_frame/test/chrome_frame_automation_mock.cc
index 8b553a5bf3cd04ad691a8c7c854dcfe0f2484d70..d3077124943dcbfba2405c6e509bbf4f2c838a19 100644
--- a/chrome_frame/test/chrome_frame_automation_mock.cc
+++ b/chrome_frame/test/chrome_frame_automation_mock.cc
@@ -16,7 +16,8 @@ TEST(ChromeFrame, Launch) {
   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());
 }
 
@@ -28,7 +29,8 @@ TEST(ChromeFrame, Navigate) {
   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());
 }
 
@@ -40,7 +42,8 @@ TEST(ChromeFrame, PostMessage) {
   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());
 }
 
@@ -52,7 +55,8 @@ TEST(ChromeFrame, RequestStart) {
   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());
 }