[Sheriff] Disable flaky test #showSignOutDialogBeforeSigningUserOut

Bug: 1142481
Change-Id: Icb27afd92a521b801acaa740e693eaf437569e42
TBR: bsazonov@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498946Reviewed-by: Patrick Noland <pnoland@chromium.org>
Commit-Queue: Patrick Noland <pnoland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820822}

chrome/android/javatests/src/org/chromium/chrome/browser/sync/GoogleServicesSettingsTest.java

@@ -20,6 +20,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.chromium.base.test.util.CommandLineFlags;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.flags.ChromeFeatureList;
 import org.chromium.chrome.browser.flags.ChromeSwitches;
@@ -99,6 +100,7 @@ public class GoogleServicesSettingsTest {
     @Test
     @LargeTest
     @Features.EnableFeatures(ChromeFeatureList.MOBILE_IDENTITY_CONSISTENCY)
+    @DisabledTest(message = "https://crbug.com/1142481")
     public void showSignOutDialogBeforeSigningUserOut() {
         mAccountManagerTestRule.addTestAccountThenSigninAndEnableSync();
         startGoogleServicesSettings();