Integrate browser tests with new EME player.

chrome/test/data/media/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() {
 }
 
 PrefixedClearKeyPlayer.prototype.init = function(video) {
   InitPrefixedEMEPlayer(this, video);
 };
 
 PrefixedClearKeyPlayer.prototype.onWebkitKeyMessage = function(message) {
-  if (Utils.isHeartBeatMessage(message.message)) {
-   Utils.timeLog('onWebkitKeyMessage - heart beat', message);
-    return;
-  }
-  var initData = message.message;
-  // If content uses mp4, then message.message is PSSH data. Instead of parsing
-  // that data we hard code the initData.
-  if (TestConfig.mediaType.indexOf('mp4') != -1)
-    // Temporary hack for Clear Key in v0.1.
-    initData = Utils.convertToUint8Array(KEY_ID);
+  var initData =  Utils.getInitDataFromMessage(message, TestConfig.mediaType);
+  var key = Utils.getDefaultKey(TestConfig.forceInvalidResponse);
   Utils.timeLog('Adding key to sessionID: ' + message.sessionId);
-  message.target.webkitAddKey(TestConfig.keySystem, KEY, initData,
+  message.target.webkitAddKey(TestConfig.keySystem, key, initData,
                               message.sessionId);
 };