Stop including roboto.woff files on Android

ui/webui/resources/css/roboto.css

 /* Copyright 2015 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. */
 
-<if expr="not chromeos">
+<if expr="not chromeos and not is_android">
 @font-face {
   font-family: 'Roboto';
   font-style: normal;
   font-weight: 400;
   src: local('Roboto'), local('Roboto-Regular'),
       url(chrome://resources/roboto/roboto-regular.woff2) format('woff2');
 }
 
 @font-face {
   font-family: 'Roboto';
   font-style: normal;
   font-weight: 500;
   src: local('Roboto Medium'), local('Roboto-Medium'),
       url(chrome://resources/roboto/roboto-medium.woff2) format('woff2');
 }
 
 @font-face {
   font-family: 'Roboto';
   font-style: normal;
   font-weight: 700;
   src: local('Roboto Bold'), local('Roboto-Bold'),
       url(chrome://resources/roboto/roboto-bold.woff2) format('woff2');
 }
 </if>