Revert disabled test for crbug/419370

chrome/browser/ui/webui/options/startup_page_list_browsertest.js

 // Copyright 2013 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.
 
 /**
  * Fixture for startup pages WebUI tests.
  * @extends {testing.Test}
  * @constructor
  */
 function StartupPageListWebUITest() {}
@@ skipping 104 matching lines @@
  * installed.
  * @param {string} type A type of mouse event (e.g. 'drop').
  * @return {!Event} A fake mouse event.
  */
 function createMouseEvent(type) {
   var event = new MouseEvent(type, {bubbles: true, cancelable: true});
   MockDataTransfer.install(event);
   return event;
 }
 
-// Disabled due to: crbug.com/419370
-TEST_F('StartupPageListWebUITest', 'DISABLED_testDropFromOutsideSource',
+// Disable if flaky again (crbug.com/419370)
+TEST_F('StartupPageListWebUITest', 'testDropFromOutsideSource',
        function() {
   /** @const */ var NEW_PAGE = 'http://google.com';
 
   var mockDropEvent = createMouseEvent('drop');
   mockDropEvent.dataTransfer.setData('url', NEW_PAGE);
 
   this.mockHandler.expects(once()).addStartupPage([NEW_PAGE, 0]);
 
   this.getList().items[0].dispatchEvent(mockDropEvent);
 
   expectTrue(mockDropEvent.defaultPrevented);
 });
 
-// Disabled due to: crbug.com/419370
-TEST_F('StartupPageListWebUITest', 'DISABLED_testDropToReorder', function() {
+// Disable if flaky again (crbug.com/419370)
+TEST_F('StartupPageListWebUITest', 'testDropToReorder', function() {
   // TODO(dbeam): mock4js doesn't handle complex arguments well. Fix this.
   this.mockHandler.expects(once()).dragDropStartupPage([0, [1].join()]);
 
   this.getList().selectionModel.selectedIndex = 1;
   expectEquals(1, this.getList().selectionModel.selectedIndexes.length);
 
   this.getList().items[0].dispatchEvent(createMouseEvent('drop'));
 });
 
 }());