Set text-rendering to 'auto' when font shorthand is used in html.css.

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 379 matching lines @@
 }
 
 /* Form controls don't go vertical. */
 input, textarea, keygen, select, button, meter, progress {
     -webkit-writing-mode: horizontal-tb !important;
 }
 
 input, textarea, keygen, select, button {
     margin: 0__qem;
     font: -webkit-small-control;
+    text-rendering: auto; /* FIXME: Remove when tabs work with optimizeLegibility. */
     color: initial;
     letter-spacing: normal;
     word-spacing: normal;
     line-height: normal;
     text-transform: none;
     text-indent: 0;
     text-shadow: none;
     display: inline-block;
     text-align: start;
 }
@@ skipping 695 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. */