Disable flaky SpokenFeedbackTest.NavigateSystemTray test on CrOS.

Bug: 776308
Change-Id: Ief862b6566f4534468b9ef2228911fff6c0efc10
Tbr: dmazzoni@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/824962Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Commit-Queue: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523805}

chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc

@@ -397,7 +397,7 @@ IN_PROC_BROWSER_TEST_P(SpokenFeedbackTest, OpenStatusTray) {
 
 // Fails on ASAN. See http://crbug.com/776308 . (Note MAYBE_ doesn't work well
 // with parameterized tests).
-#if !defined(ADDRESS_SANITIZER)
+#if !defined(ADDRESS_SANITIZER) && !defined(OS_CHROMEOS)
 IN_PROC_BROWSER_TEST_P(SpokenFeedbackTest, NavigateSystemTray) {
   EnableChromeVox();
 
@@ -456,7 +456,7 @@ IN_PROC_BROWSER_TEST_P(SpokenFeedbackTest, NavigateSystemTray) {
       break;
   }
 }
-#endif  // !defined(ADDRESS_SANITIZER)
+#endif  // !defined(ADDRESS_SANITIZER) && !defined(OS_CHROMEOS)
 
 // See http://crbug.com/443608
 IN_PROC_BROWSER_TEST_P(SpokenFeedbackTest, DISABLED_ScreenBrightness) {