Fix some more for= usage.

chrome/browser/resources/options/reset_profile_settings_overlay.css

 /* 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. */
 
 #reset-profile-settings-overlay {
   width: 500px;
 }
 
 #reset-profile-settings-content-area {
   -webkit-box-flex: 0;
@@ skipping 30 matching lines @@
   vertical-align: top;
 }
 
 #feedback-template .value {
   color: #333;
   text-align: left;
   white-space: pre-line;
 }
 
 #expand-feedback {
-  background: center bottom no-repeat;
-  background-image: url('chrome://theme/IDR_QUESTION_MARK');
+  background: url('chrome://theme/IDR_QUESTION_MARK') no-repeat center;
   display: inline-block;
   height: 14px;
   opacity: 0.33;
-  vertical-align: text-top;
   width: 14px;
 }
 
 #expand-feedback:hover {
   opacity: 1;
-}
+}