Make Roboto accessible from chrome://resources

chrome/browser/resources/contextual_search/promo.css

 /* Copyright 2014 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. */
 
 /* TODO: Need to clean up @font-face after we remove font-family from body. */
 @font-face {
   font-family: 'Roboto2';
   font-weight: 400;
   src: local('Roboto'), local('Roboto2-Regular'),
-      url(/roboto.woff2) format('woff2'), url(/roboto.woff) format('woff');
+      url(chrome://resources/roboto/roboto.woff2) format('woff2'),
+      url(chrome://resources/roboto/roboto.woff) format('woff');
 }
 
 body {
   color: #414141;
   font-family: 'Roboto2', sans-serif;
   margin: 0;
 }
 
 a {
   text-decoration: none;
@@ skipping 84 matching lines @@
   margin-right: 24px;
 }
 
 #optin-button .caption {
   color: white;
 }
 
 #optout-button .caption {
   color: rgb(66, 133, 244);
 }