Update eme_player tests

media/test/data/eme_player_js/widevine_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.
 
 // Widevine player responsible for playing media using Widevine key system
 // and EME working draft API.
 function WidevinePlayer(video, testConfig) {
   this.video = video;
   this.testConfig = testConfig;
 }
 
 WidevinePlayer.prototype.init = function() {
   PlayerUtils.initEMEPlayer(this);
 };
 
 WidevinePlayer.prototype.registerEventListeners = function() {
   PlayerUtils.registerEMEEventListeners(this);
 };
 
 WidevinePlayer.prototype.onMessage = function(message) {
   Utils.timeLog('MediaKeySession onMessage', message);
   var mediaKeySession = message.target;
   function onSuccess(response) {
     var key = new Uint8Array(response);
     Utils.timeLog('Update media key session with license response.', key);
-    if (PROMISES_SUPPORTED) {
-      mediaKeySession.update(key).catch(function(error) {
-        Utils.failTest(error, KEY_ERROR);
-      });
-    } else {
-      mediaKeySession.update(key);
-    }
-
+    mediaKeySession.update(key).catch(function(error) {
+      Utils.failTest(error, KEY_ERROR);
+    });
   }
   Utils.sendRequest('POST',
                     'arraybuffer',
                     Utils.convertToUint8Array(message.message),
                     this.testConfig.licenseServerURL,
                     onSuccess,
                     this.testConfig.forceInvalidResponse);
 };