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

chrome/browser/crash_recovery_browsertest.cc

Index: chrome/browser/crash_recovery_browsertest.cc
diff --git a/chrome/browser/crash_recovery_browsertest.cc b/chrome/browser/crash_recovery_browsertest.cc
index 025ae9c5aa383271f7906160b2dc20d8b81e7e8c..0198e183d63fbfb2eed6653ff31c27e8c653b27f 100644
--- a/chrome/browser/crash_recovery_browsertest.cc
+++ b/chrome/browser/crash_recovery_browsertest.cc
@@ -76,6 +76,8 @@ IN_PROC_BROWSER_TEST_F(CrashRecoveryBrowserTest, LoadInNewTab) {
   string16 title_before_crash;
   string16 title_after_crash;
 
+  // Wait for MessageLoop to go idle to make sure title is set.
+  ui_test_utils::RunAllPendingInMessageLoop();
   ASSERT_TRUE(ui_test_utils::GetCurrentTabTitle(browser(),
                                                 &title_before_crash));
   SimulateRendererCrash(browser());
@@ -86,6 +88,9 @@ IN_PROC_BROWSER_TEST_F(CrashRecoveryBrowserTest, LoadInNewTab) {
               GetController()));
   browser()->Reload(CURRENT_TAB);
   observer.Wait();
+
+  // Wait for MessageLoop to go idle to make sure title is set.
+  ui_test_utils::RunAllPendingInMessageLoop();
   ASSERT_TRUE(ui_test_utils::GetCurrentTabTitle(browser(),
                                                 &title_after_crash));
   EXPECT_EQ(title_before_crash, title_after_crash);