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

media/test/data/eme_player_js/app_loader.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.
 
 // Adds a Javascript source tag to the document.
 function addScriptTag(src) {
   document.write(
       '<script type="text/javascript" src="eme_player_js/' + src +
       '"></script>');
 }
 
 // Load all the dependencies for the app.
 addScriptTag('globals.js');
 addScriptTag('utils.js');
 addScriptTag('test_config.js');
 addScriptTag('fps_observer.js');
 addScriptTag('media_source_utils.js');
 addScriptTag('player_utils.js');
 addScriptTag('prefixed_clearkey_player.js');
 addScriptTag('clearkey_player.js');
 addScriptTag('widevine_player.js');
 addScriptTag('prefixed_widevine_player.js');
 addScriptTag('file_io_test_player.js');
 addScriptTag('eme_app.js');