Add Autofill preview support for <select> input fields

Source/core/css/html.css

 /*
  * The default style sheet used to render HTML.
  *
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 668 matching lines @@
     background-color: initial;
     border: initial;
 }
 
 input[type="file"] {
     align-items: baseline;
     color: inherit;
     text-align: start !important;
 }
 
-input:-webkit-autofill, textarea:-webkit-autofill {
+input:-webkit-autofill, textarea:-webkit-autofill, select:-webkit-autofill {
     background-color: #FAFFBD !important;
     background-image:none !important;
     color: #000000 !important;
 }
 
 input[type="radio"], input[type="checkbox"] {
     margin: 3px 0.5ex;
     padding: initial;
     background-color: initial;
     border: initial;
@@ skipping 465 matching lines @@
 @page {
     /* FIXME: Define the right default values for page properties. */
     size: auto;
     margin: auto;
     padding: 0px;
     border-width: 0px;
 }
 
 /* noscript is handled internally, as it depends on settings. */