Disable SyncSetupWebUITestAsync.VerifySignIn, now also on MacOS X

chrome/browser/ui/webui/sync_setup_browsertest.js

Index: chrome/browser/ui/webui/sync_setup_browsertest.js
diff --git a/chrome/browser/ui/webui/sync_setup_browsertest.js b/chrome/browser/ui/webui/sync_setup_browsertest.js
index a9d429a651055c7021baee2eb977d43f0b2d47c5..b3654ce11f4569472307af3faed4417767c0c88d 100644
--- a/chrome/browser/ui/webui/sync_setup_browsertest.js
+++ b/chrome/browser/ui/webui/sync_setup_browsertest.js
@@ -81,14 +81,9 @@ SyncSetupWebUITestAsync.prototype = {
   },
 };
 
-// This test is flaky on Linux bot (crbug.com/579666) and Windows bot
+// This test is flaky on Linux bot (crbug.com/579666) and Windows & Mac bots
 // (crbug.com/608975).
-GEN('#if defined(OS_LINUX) || defined(OS_WIN)');
-GEN('#define MAYBE_VerifySignIn DISABLED_VerifySignIn');
-GEN('#else');
-GEN('#define MAYBE_VerifySignIn VerifySignIn');
-GEN('#endif  // defined(OS_LINUX) || defined(OS_WIN)');
-TEST_F('SyncSetupWebUITestAsync', 'MAYBE_VerifySignIn', function() {
+TEST_F('SyncSetupWebUITestAsync', 'DISABLED_VerifySignIn', function() {
   // Handle SyncSetupStartSignIn by displaying the sync setup dialog, verifying
   // that a confirmation dialog appears, and clicking OK to dismiss the dialog.
   // Note that this test doesn't actually do a gaia sign in.