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

chrome/test/data/media/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');