Disable TwoClientPasswordsSyncTest,.SetPassphraseAndAddPassword on CrOS

TBR=vitaliii@chromium.org
NOTRY=true

Bug: 873494
Change-Id: I1395c30a000ac7033b1e8711caac1132add2ad94
Reviewed-on: https://chromium-review.googlesource.com/1172265Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582528}

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

@@ -72,8 +72,14 @@ IN_PROC_BROWSER_TEST_F(TwoClientPasswordsSyncTest, E2E_ENABLED(Race)) {
   ASSERT_TRUE(SamePasswordFormsChecker().Wait());
 }
 
+// Disabled due to flakiness on Chrome OS: https://crbug.com/873494.
+#if defined(OS_CHROMEOS)
+#define MAYBE_SetPassphraseAndAddPassword DISABLED_SetPassphraseAndAddPassword
+#else
+#define MAYBE_SetPassphraseAndAddPassword SetPassphraseAndAddPassword
+#endif
 IN_PROC_BROWSER_TEST_F(TwoClientPasswordsSyncTest,
-                       E2E_ENABLED(SetPassphraseAndAddPassword)) {
+                       E2E_ENABLED(MAYBE_SetPassphraseAndAddPassword)) {
   ASSERT_TRUE(SetupSync()) << "SetupSync() failed.";
 
   GetSyncService(0)->SetEncryptionPassphrase(