Fixed Cache Storage inspector blank cells, updated tests

Source/devtools/front_end/resources/ServiceWorkerCacheViews.js

 // 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.
 
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  * @param {!WebInspector.ServiceWorkerCacheModel} model
  * @param {!WebInspector.ServiceWorkerCacheModel.Cache} cache
  */
@@ skipping 149 matching lines @@
     },
 
     __proto__: WebInspector.VBox.prototype
 }
 
 /**
  * @constructor
  * @extends {WebInspector.DataGridNode}
  * @param {!Object.<string, *>} data
  */
 WebInspector.SWCacheDataGridNode = function(data)

[pfeldman, 2015/05/12 05:28:53]

There are no overrides. Drop the class altogether?

[dmurph, 2015/05/12 05:33:50]

SGTM

 {
     WebInspector.DataGridNode.call(this, data, false);
     this.selectable = true;
 }
 
 WebInspector.SWCacheDataGridNode.prototype = {
-    /**
-     * @override
-     * @return {!Element}
-     */
-    createCell: function(columnIdentifier)
-    {
-        var cell = WebInspector.DataGridNode.prototype.createCell.call(this, columnIdentifier);
-        var value = this.data[columnIdentifier];
-
-        switch (columnIdentifier) {
-        case "request":
-        case "response":
-            cell.removeChildren();
-            var objectElement = WebInspector.ObjectPropertiesSection.defaultObjectPresentation(value, true);
-            cell.appendChild(objectElement);
-            break;
-        default:
-        }
-
-        return cell;
-    },
-
     __proto__: WebInspector.DataGridNode.prototype
 }