Fixed Cache Storage inspector blank cells, updated tests

LayoutTests/http/tests/inspector/cache-storage/cache-storage-test.js

 // Copyright 2015 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.
 
 var initialize_CacheStorageTest = function() {
 InspectorTest.preloadPanel("resources");
 
 InspectorTest.dumpCacheTree = function()
 {
     WebInspector.panels.resources.cacheStorageListTreeElement.expand();
@@ skipping 24 matching lines @@
                     view._updateData(true);
                 view = cacheTreeElement._view;
 
                 function addDataResult()
                 {
                     if (view._entries.length == 0) {
                         InspectorTest.addResult("        (cache empty)");
                         nextOrResolve();
                         return;
                     }
-                    for (var entry of view._entries)
-                        InspectorTest.addResult("        '" + entry.request + "': '" + entry.response + "'");
+                    var dataGrid = view._dataGrid;
+                    for (var node of dataGrid.rootNode().children) {
+                        var entries = [];
+                        for (var j = 0; j < node.element().children.length; j++) {
+                            var td = node.element().children[j];
+                            if (td.textContent)
+                                entries.push(td.textContent);
+                        }
+                        InspectorTest.addResult("        " + entries.join(", "));
+                    }
                     nextOrResolve();
                 }
 
                 function nextOrResolve()
                 {
                     var next = i + 1;
                     if (next < cachesTreeElement.childCount())
                         queryView(next);
                     else
                         resolve();
@@ skipping 146 matching lines @@
 {
     caches.keys()
         .then(function(keys) {
             return Promise.all(keys.map(function(key) {
                 return caches.delete(key);
             }));
         })
         .then(resolve)
         .catch(onCacheStorageError.bind(this, reject));
 }