Disable flaky KerberosCredentialManagerTest.UpdateAccountsFromPrefRetry

BUG=1121383
TBR=fsandrade@chromium.org,pmonette@chromium.org

Change-Id: Iaa01171f9bf3d6ff2ae522d528b6319ab99e7b12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2373390Reviewed-by: Matthew Wolenetz <wolenetz@chromium.org>
Commit-Queue: Matthew Wolenetz <wolenetz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801219}

chrome/browser/chromeos/kerberos/kerberos_credentials_manager_test.cc

@@ -1123,7 +1123,8 @@ TEST_F(KerberosCredentialsManagerTest, UpdateAccountsFromPrefClearAccounts) {
 
 // UpdateAccountsFromPref retries to add account if addition fails for network
 // related errors.
-TEST_F(KerberosCredentialsManagerTest, UpdateAccountsFromPrefRetry) {
+// TODO(https://crbug.com/1121383): Disabled due to flakiness.
+TEST_F(KerberosCredentialsManagerTest, DISABLED_UpdateAccountsFromPrefRetry) {
   // Starting with Kerberos enabled.
   SetPref(prefs::kKerberosEnabled, base::Value(true));