Remove prefixed EME.

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() {
-  // Returns a promise.
-  return PlayerUtils.initEMEPlayer(this);
-};
-
-PrefixedClearKeyPlayer.prototype.registerEventListeners = function() {
-  // Returns a promise.
-  return PlayerUtils.registerPrefixedEMEEventListeners(this);
-};
-
-PrefixedClearKeyPlayer.prototype.onWebkitKeyMessage = function(message) {
-  var initData = Utils.convertToUint8Array(message.message);
-  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);
-};