Have media content and chrome browser tests load data from media/test/data

media/test/data/eme_player_js/prefixed_clearkey_player.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.
 
 // ClearKey player responsible for playing media using Clear Key key system and
 // prefixed EME API.
 function PrefixedClearKeyPlayer(video, testConfig) {
   this.video = video;
   this.testConfig = testConfig;
 }
 
 PrefixedClearKeyPlayer.prototype.init = function() {
   PlayerUtils.initPrefixedEMEPlayer(this);
 };
 
 PrefixedClearKeyPlayer.prototype.registerEventListeners = function() {
   PlayerUtils.registerPrefixedEMEEventListeners(this);
 };
 
 PrefixedClearKeyPlayer.prototype.onWebkitKeyMessage = function(message) {
   var initData =
       Utils.getInitDataFromMessage(message, this.testConfig.mediaType);
   var key = Utils.getDefaultKey(this.testConfig.forceInvalidResponse);
   Utils.timeLog('Adding key to sessionID: ' + message.sessionId);
   message.target.webkitAddKey(this.testConfig.keySystem, key, initData,
                               message.sessionId);
 };