Disable TestAsNormalAndGuestUser/SpokenFeedbackTest.ChromeVoxStickyMode as it's flaky.

chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc

Index: chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc
diff --git a/chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc b/chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc
index 0168017d8748a47454be01b1d9f3f71b1352c175..e2fde84501e714db341152aa58e1be6e2617643f 100644
--- a/chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc
+++ b/chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc
@@ -357,7 +357,8 @@ IN_PROC_BROWSER_TEST_P(SpokenFeedbackTest, ChromeVoxNavigateAndSelect) {
   EXPECT_EQ("Title", speech_monitor_.GetNextUtterance());
 }
 
-IN_PROC_BROWSER_TEST_P(SpokenFeedbackTest, ChromeVoxStickyMode) {
+// flaky: http://crbug.com/418572
+IN_PROC_BROWSER_TEST_P(SpokenFeedbackTest, DISABLED_ChromeVoxStickyMode) {
   LoadChromeVoxAndThenNavigateToURL(
       GURL("data:text/html;charset=utf-8,"
            "<label>Enter your name <input autofocus></label>"