Disable flaky OobeSpokenFeedbackTest.ChromeVoxPanelTabsMenuEmpty

TBR=akihiroota

Bug: 981100, 1013551
Change-Id: I50890923e35a6d6196a14dcdd48d40367d166f52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856059Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705088}

chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc

@@ -832,7 +832,9 @@ IN_PROC_BROWSER_TEST_F(OobeSpokenFeedbackTest, DISABLED_SpokenFeedbackInOobe) {
                                  "Combo box * of *"));
 }
 
-IN_PROC_BROWSER_TEST_F(OobeSpokenFeedbackTest, ChromeVoxPanelTabsMenuEmpty) {
+// This test is flaky (https://crbug.com/1013551).
+IN_PROC_BROWSER_TEST_F(OobeSpokenFeedbackTest,
+                       DISABLED_ChromeVoxPanelTabsMenuEmpty) {
   // The ChromeVox panel should not populate the tabs menu if we are in the
   // OOBE.
   ASSERT_FALSE(AccessibilityManager::Get()->IsSpokenFeedbackEnabled());