Revert of Disable flaky SyncSetupWebUITestAsync.VerifySignIn test on Windows.

chrome/browser/ui/webui/sync_setup_browsertest.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 GEN('#if !defined(OS_CHROMEOS)');
 
 /**
  * Test fixture for sync setup WebUI testing.
  * @constructor
  * @extends {testing.Test}
@@ skipping 63 matching lines @@
     this.verifyUnsynced();
 
     // Handle SyncSetupShowSetupUI by navigating to chrome://settings/syncSetup.
     this.mockHandler.expects(once()).SyncSetupShowSetupUI().will(callFunction(
         function() {
       PageManager.showPageByName('syncSetup');
     }));
   },
 };
 
-// This test is flaky on Linux bot (crbug.com/579666) and Windows bot
-// (crbug.com/608975).
-GEN('#if defined(OS_LINUX) || defined(OS_WIN)');
+// This test is flaky on Linux bot. See crbug.com/579666
+GEN('#if defined(OS_LINUX)');
 GEN('#define MAYBE_VerifySignIn DISABLED_VerifySignIn');
 GEN('#else');
 GEN('#define MAYBE_VerifySignIn VerifySignIn');
-GEN('#endif  // defined(OS_LINUX) || defined(OS_WIN)');
+GEN('#endif  // defined(OS_LINUX)');
 TEST_F('SyncSetupWebUITestAsync', 'MAYBE_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.
   this.mockHandler.expects(once()).SyncSetupStartSignIn(
     [false] /* createSupervisedUser */).will(callFunction(function() {
     SyncSetupOverlay.showSyncSetupPage('configure');
     var okButton = $('confirm-everything-ok');
     assertNotEquals(null, okButton);
     okButton.click();
@@ skipping 33 matching lines @@
     cr.dispatchSimpleEvent($('sync-select-datatypes'), 'change', true);
     assertFalse($('bookmarks-checkbox').checked);
 
     testDone();
   }));
 
   this.startSyncing();
 });
 
 GEN('#endif  // OS_CHROMEOS');