IndexedDB: Stop using webkit-prefixed versions of APIs in tests

ui/file_manager/image_loader/cache.js

 // Copyright 2013 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.
 
 'use strict';
 
 /**
  * Persistent cache storing images in an indexed database on the hard disk.
  * @constructor
  */
@@ skipping 53 matching lines @@
 };
 
 /**
  * Initializes the cache database.
  * @param {function()} callback Completion callback.
  */
 Cache.prototype.initialize = function(callback) {
   // Establish a connection to the database or (re)create it if not available
   // or not up to date. After changing the database's schema, increment
   // Cache.DB_VERSION to force database recreating.
-  var openRequest = window.webkitIndexedDB.open(Cache.DB_NAME,
-                                                Cache.DB_VERSION);
+  var openRequest = window.indexedDB.open(Cache.DB_NAME, Cache.DB_VERSION);
 
   openRequest.onsuccess = function(e) {
     this.db_ = e.target.result;
     callback();
   }.bind(this);
 
   openRequest.onerror = callback;
 
   openRequest.onupgradeneeded = function(e) {
     console.info('Cache database creating or upgrading.');
@@ skipping 315 matching lines @@
     metadataReceived = true;
     onPartialSuccess();
   };
 
   metadataRequest.onerror = function() {
     console.error('Failed to remove an image.');
     metadataReceived = true;
     onPartialSuccess();
   };
 };