Use EventHandler type instead of EventListener for event handler attributes

Source/core/html/HTMLMediaElement.idl

 /*
  * Copyright (C) 2007, 2010, 2011, 2012 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 74 matching lines @@
 
 // The number of bytes consumed by the media decoder.
 readonly attribute unsigned long webkitAudioDecodedByteCount;
 readonly attribute unsigned long webkitVideoDecodedByteCount;
 
 // FIXME: add DeprecateAs=PrefixedMediaGenerateKeyRequest when MediaKeys is ready.
 [EnabledAtRuntime=legacyEncryptedMedia, RaisesException] void webkitGenerateKeyRequest([TreatNullAs=NullString, TreatUndefinedAs=NullString] DOMString keySystem, optional Uint8Array initData);
 [EnabledAtRuntime=legacyEncryptedMedia, RaisesException] void webkitAddKey([TreatNullAs=NullString, TreatUndefinedAs=NullString] DOMString keySystem, Uint8Array key, optional Uint8Array initData, [Default=NullString] optional DOMString sessionId);
 [EnabledAtRuntime=legacyEncryptedMedia, RaisesException] void webkitCancelKeyRequest([TreatNullAs=NullString, TreatUndefinedAs=NullString] DOMString keySystem, [Default=NullString] optional DOMString sessionId);
 
-[EnabledAtRuntime=legacyEncryptedMedia] attribute EventListener onwebkitkeyadded;
-[EnabledAtRuntime=legacyEncryptedMedia] attribute EventListener onwebkitkeyerror;
-[EnabledAtRuntime=legacyEncryptedMedia] attribute EventListener onwebkitkeymessage;
-[EnabledAtRuntime=legacyEncryptedMedia] attribute EventListener onwebkitneedkey;
+[EnabledAtRuntime=legacyEncryptedMedia] attribute EventHandler onwebkitkeyadded;
+[EnabledAtRuntime=legacyEncryptedMedia] attribute EventHandler onwebkitkeyerror;
+[EnabledAtRuntime=legacyEncryptedMedia] attribute EventHandler onwebkitkeymessage;
+[EnabledAtRuntime=legacyEncryptedMedia] attribute EventHandler onwebkitneedkey;
 
 [EnabledAtRuntime=encryptedMedia, Conditional=ENCRYPTED_MEDIA_V2] attribute MediaKeys mediaKeys;
 
 [EnabledAtRuntime=videoTrack, RaisesException] TextTrack addTextTrack(DOMString kind, optional DOMString label, optional DOMString language);
 [EnabledAtRuntime=videoTrack] readonly attribute TextTrackList textTracks;
 
 [Reflect, TreatNullAs=NullString] attribute DOMString mediaGroup;
 [CustomSetter] attribute MediaController controller;
 };