feedback UI: use native window controls on Mac

chrome/test/data/extensions/api_test/feedback_private/basic/test.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.
 
 chrome.test.runTests([
   function getUserEmailTest() {
     chrome.feedbackPrivate.getUserEmail(
         chrome.test.callbackPass(function(email) {
       if (email.length > 0) {
         // If we actually have an e-mail address returned, do a simple sanity
         // check on it.
         chrome.test.assertTrue(email.indexOf('@') != -1);
       }
     }));
   },
   function getSystemInfoTest() {
     chrome.feedbackPrivate.getSystemInformation(
         chrome.test.callbackPass(function(sysinfo) {
       // Make sure we get 'some' system info.
       chrome.test.assertTrue(sysinfo.length >= 1);
     }));
   },
   function sendFeedbackTest() {
     var feedbackInfo = {
       description: 'This is a test description',
-      sendHistograms: false
+      sendHistograms: false,
+      useSystemWindowFrame: false
     };
     chrome.feedbackPrivate.sendFeedback(
         feedbackInfo, chrome.test.callbackPass(function(response) {
       chrome.test.assertEq(response, 'success');
     }));
   }
 ]);