Disable SyncAuthTest due to flakiness

TBR=treib@chromium.org

Bug: 860200
Change-Id: Id0a9b33a4dc185ab7834fbf0dbf478ae3d6e8d26
Reviewed-on: https://chromium-review.googlesource.com/1126101Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572548}

chrome/browser/sync/test/integration/sync_auth_test.cc

@@ -264,7 +264,8 @@ IN_PROC_BROWSER_TEST_F(SyncAuthTest, RetryInitialSetupWithTransientError) {
 }
 
 // Verify that ProfileSyncService fetches a new token when an old token expires.
-IN_PROC_BROWSER_TEST_F(SyncAuthTest, TokenExpiry) {
+// Disabled due to flakiness: https://crbug.com/860200
+IN_PROC_BROWSER_TEST_F(SyncAuthTest, DISABLED_TokenExpiry) {
   // Initial sync succeeds with a short lived OAuth2 Token.
   ASSERT_TRUE(SetupClients());
   GetFakeServer()->SetAuthenticated();