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 94 matching lines @@
     _updateDataCallback(skipCount, entries, hasMore)
     {
         this._refreshButton.setEnabled(true);
         this.clear();
         this._entries = entries;
         for (var i = 0; i < entries.length; ++i) {
             var data = {};
             data["number"] = i + skipCount;
             data["request"] = entries[i].request;
             data["response"] = entries[i].response;
-            var node = new WebInspector.SWCacheDataGridNode(data);
+            var node = new WebInspector.DataGridNode(data);
+            node.selectable = true;
             this._dataGrid.rootNode().appendChild(node);
         }
         this._pageBackButton.setEnabled(!!skipCount);
         this._pageForwardButton.setEnabled(hasMore);
     },
 
     /**
      * @param {boolean} force
      */
     _updateData: function(force)
@@ skipping 28 matching lines @@
     },
 
     clear: function()
     {
         this._dataGrid.rootNode().removeChildren();
         this._entries = [];
     },
 
     __proto__: WebInspector.VBox.prototype
 }
-
-/**
- * @constructor
- * @extends {WebInspector.DataGridNode}
- * @param {!Object.<string, *>} data
- */
-WebInspector.SWCacheDataGridNode = function(data)
-{
-    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
-}