Convert MediaKeyStatusMap to iterable<BufferSource,MediaKeyStatus>

LayoutTests/media/encrypted-media/encrypted-media-utils.js

 var consoleDiv = null;
 
 function consoleWrite(text)
 {
     if (!consoleDiv && document.body) {
         consoleDiv = document.createElement('div');
         document.body.appendChild(consoleDiv);
     }
     var span = document.createElement('span');
     span.appendChild(document.createTextNode(text));
@@ skipping 125 matching lines @@
     }
     consoleWrite("for (var value of keyStatuses.values())");
     for (var value of keyStatuses.values()) {
         consoleWrite(value);
     }
     consoleWrite("for (var entry of keyStatuses.entries())");
     for (var entry of keyStatuses.entries()) {
         consoleWrite(arrayBufferAsString(entry[0]) + ", " + entry[1]);
     }
     consoleWrite("keyStatuses.forEach()");
-    keyStatuses.forEach(function(value, key, map) {
+    keyStatuses.forEach(function(value, key) {
         consoleWrite(arrayBufferAsString(key) + ", " + value);
     });
 }
 
 // Verify that |keyStatuses| contains just the keys in |keys.expected|
 // and none of the keys in |keys.unexpected|. All keys should have status
 // 'usable'. Example call: verifyKeyStatuses(mediaKeySession.keyStatuses,
 // { expected: [key1], unexpected: [key2] });
 function verifyKeyStatuses(keyStatuses, keys)
 {
@@ skipping 132 matching lines @@
     video.play();
     return new Promise(function(resolve) {
         video.addEventListener('timeupdate', function listener(event) {
             if (event.target.currentTime < duration)
                 return;
             video.removeEventListener(listener);
             resolve('success');
         });
     });
 }