Update browser tests to support upcoming EME parameter type changes.

chrome/test/data/media/eme_player_js/player_utils.js

Index: chrome/test/data/media/eme_player_js/player_utils.js
diff --git a/chrome/test/data/media/eme_player_js/player_utils.js b/chrome/test/data/media/eme_player_js/player_utils.js
index ac7b6dd10e56a0bf23613fb42b68ed3557babdf6..abb854f82c8a78d65e1de6c2b673ffd0eddd96e3 100644
--- a/chrome/test/data/media/eme_player_js/player_utils.js
+++ b/chrome/test/data/media/eme_player_js/player_utils.js
@@ -42,7 +42,8 @@ PlayerUtils.registerEMEEventListeners = function(player) {
     function addMediaKeySessionListeners(mediaKeySession) {
       mediaKeySession.addEventListener('message', function(message) {
         player.video.receivedKeyMessage = true;
-        if (Utils.isHeartBeatMessage(message.message)) {
+        if (Utils.isHeartBeatMessage(
+                Utils.convertToUint8Array(message.message))) {

[ddorwin, 2014/07/20 22:35:05]

Hide this in iHBM()?

[jrummell, 2014/07/23 22:30:05]

Done.

           Utils.timeLog('MediaKeySession onMessage - heart beat', message);
           player.video.receivedHeartbeat = true;
         }
@@ -120,7 +121,7 @@ PlayerUtils.registerPrefixedEMEEventListeners = function(player) {
   player.video.addEventListener('webkitkeymessage', function(message) {
     Utils.timeLog('onWebkitKeyMessage', message);
     message.target.receivedKeyMessage = true;
-    if (Utils.isHeartBeatMessage(message.message)) {
+    if (Utils.isHeartBeatMessage(Utils.convertToUint8Array(message.message))) {
       Utils.timeLog('onWebkitKeyMessage - heart beat', message);
       message.target.receivedHeartbeat = true;
     }