Update builder revisions to use new format

Tools/GardeningServer/model/ct-builder-revisions-mock.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-revisions.html'>
 
 <script>
 (function () {
 
 var kExampleBuilderRevisions =
     {
       "Linux": {
-        "v8": "22785",
-        "chromium": "287303",
-        "nacl": "13580",
-        "blink": "158544"
-       },
-       "Android": {
-        "v8": "22785",
-        "chromium": "287303",
-        "nacl": "13580",
-        "blink": "158543"
-       }
+        "revisions": {
+          "v8": "22785",
+          "chromium": "287303",
+          "nacl": "13580",
+          "blink": "158544"
+        }
+      },
+      "Android": {
+        "revisions": {
+          "v8": "22785",
+          "chromium": "287303",
+          "nacl": "13580",
+          "blink": "158543"
+        }
+      }
     }
 
 window.CTBuilderRevisionsMock = function() {
   return new CTBuilderRevisions(kExampleBuilderRevisions);
 };
 
 })();
 </script>