webui: make 0 into 0ms when it's a <time>.

chrome/common/extensions/docs/examples/api/fontSettings/css/chrome_shared.css

 /* Copyright (c) 2012 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. */
 
 /* Copy of /resources/shared/css/chrome_shared.css for sample extension. */
 
 /* Prevent CSS from overriding the hidden property. */
 [hidden] {
   display: none !important;
 }
 
 html.loading * {
-  -webkit-transition-delay: 0 !important;
-  -webkit-transition-duration: 0 !important;
+  -webkit-transition-delay: 0ms !important;
+  -webkit-transition-duration: 0ms !important;
 }
 
 body {
   cursor: default;
   margin: 0;
 }
 
 p {
   line-height: 1.8em;
 }
@@ skipping 66 matching lines @@
 }
 
 /* WebKit does not honor alignment for text specified via placeholder attribute.
  * This CSS is a workaround. Please remove once WebKit bug is fixed.
  * https://bugs.webkit.org/show_bug.cgi?id=63367
  */
 html[dir='rtl'] input.weakrtl::-webkit-input-placeholder,
 html[dir='rtl'] .weakrtl input::-webkit-input-placeholder {
   direction: rtl;
 }