Display different icons for different device types.

chrome/browser/resources/local_discovery/local_discovery.css

 /* Copyright 2013 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. */
 
 body {
   margin: 21px 10px 24px 10px;
 }
 
 h1 {
   margin: 0 0 13px 0;
 }
 
 h2 {
     margin: 23px 0 0 0;
 }
 
 header {
   border-bottom: 1px solid #eee;
   max-width: 718px;
 }
 
 .device {
+  background: url(device.png) no-repeat;
   margin: 23px 0;
   max-width: 695px;
   overflow: hidden;
 }
 
 .device .device-info {
   -webkit-padding-start: 40px;
   float: left;
 }
 
@@ skipping 68 matching lines @@
   margin: 23px 0;
 }
 
 section {
   margin-bottom: 23px;
 }
 
 .dialog-contents {
     padding-left: 17px;
 }