Restore RuntimeEnabled=PrefixedEncryptedMedia to MediaKeyError.idl.

Source/core/html/MediaError.idl

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 13 matching lines @@
  */
 
 [
     RuntimeEnabled=Media,
     WillBeGarbageCollected,
 ] interface MediaError {
     const unsigned short MEDIA_ERR_ABORTED = 1;
     const unsigned short MEDIA_ERR_NETWORK = 2;
     const unsigned short MEDIA_ERR_DECODE = 3;
     const unsigned short MEDIA_ERR_SRC_NOT_SUPPORTED = 4;
+    [RuntimeEnabled=PrefixedEncryptedMedia]

[ddorwin, 2014/12/12 17:55:46]

philipj removed the value a couple weeks ago in
https://codereview.chromium.org/724573004, so this is no longer needed.

[philipj_slow, 2014/12/12 20:42:13]

Right, it would actually apply to the code attribute below, which would be
bad...

[MRV, 2014/12/15 03:16:17]

Done.

[MRV, 2014/12/15 03:16:17]

Done.

     readonly attribute unsigned short code;
 };