Fixed Cache Storage inspector blank cells, updated tests

Source/devtools/front_end/resources/ServiceWorkerCacheViews.js

Index: Source/devtools/front_end/resources/ServiceWorkerCacheViews.js
diff --git a/Source/devtools/front_end/resources/ServiceWorkerCacheViews.js b/Source/devtools/front_end/resources/ServiceWorkerCacheViews.js
index 38cafb919e169de4662d9621aa44499318dbb2c4..05e2d0ea158b11bab91b00eb43b94449664adf39 100644
--- a/Source/devtools/front_end/resources/ServiceWorkerCacheViews.js
+++ b/Source/devtools/front_end/resources/ServiceWorkerCacheViews.js
@@ -174,27 +174,5 @@ WebInspector.SWCacheDataGridNode = function(data)
 }
 
 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
 }