Simplify failing builder lists.

Tools/GardeningServer/ui/ct-failing-builders.html

 <!--
 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.
 -->
 
 <link rel="import" href="ct-builder.html">
 
 <!-- Lists builders that are failing and the problematic steps. -->
 <polymer-element name="ct-failing-builders" attributes="builders">
   <template>
     <style>
       :host {
         display: block;
         font-size: 0;
       }
 
       ct-builder {
         display: inline-block;
         margin: 0 5px 2px 0;
       }
     </style>
     <template repeat="{{ builder in builders|keys }}">
-      <ct-builder builderName="{{ builder }}" steps="{{ builders[builder] }}"></ct-builder>
+      <ct-builder builder="{{ builder }}" steps="{{ builders[builder] }}"></ct-builder>
     </template>
   </template>
   <script>
     Polymer({
       builders: {},
 
       keys: function(obj) {
         return Object.keys(obj);
       },
     });
   </script>
 </polymer-element>