Switch buildershandler over to using the json mirror.

Tools/TestResultServer/static-dashboards/aggregate_results_unittest.js

 // Copyright (C) 2013 Google Inc. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //         * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //         * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
@@ skipping 25 matching lines @@
     for (var key in history.DEFAULT_CROSS_DASHBOARD_STATE_VALUES)
         historyInstance.crossDashboardState[key] = history.DEFAULT_CROSS_DASHBOARD_STATE_VALUES[key];
 
     var builderName = 'Blink Linux';
     LOAD_BUILDBOT_DATA({
         "no_upload_test_types": [],
         "masters": [
             {
                 "groups": [ "@ToT Blink" ],
                 "name": "ChromiumWebkit",
+                "url_name": "chromium.webkit",
                 "tests": {
                     "layout-tests": {
                         "builders": [builderName]
                     }
                 },
-                "url": "http://build.chromium.org/p/chromium.win"
             }
         ]
     });
     builders.loadBuildersList('@ToT Blink', 'layout-tests');
 
     g_resultsByBuilder[builderName] = {
         "num_failures_by_type": {
             "CRASH": [ 13, 10 ],
             "MISSING": [ 6, 8 ],
             "IMAGE+TEXT": [ 17, 17 ],
@@ skipping 96 matching lines @@
                 '<tr><td>TEXT</td><td>89</td><td>60</td></tr>' +
                 '<tr><td>TIMEOUT</td><td>72</td><td>48</td></tr>' +
                 '<tr><td>PASS</td><td>28104</td><td>28586</td></tr>' +
                 '<tr><td>AUDIO</td><td>0</td><td>0</td></tr>' +
                 '<tr><td>WONTFIX</td><td>2</td><td>2</td></tr>' +
             '</tbody>' +
         '</table>' +
     '</div>';
     equal(expectedHtml, htmlForBuilder('Blink Linux'));
 });