Update <video muted=""> handling to match spec

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 390 matching lines @@
 
     virtual const AtomicString& shadowPseudoId() const;
     void setShadowPseudoId(const AtomicString&);
 
     LayoutSize minimumSizeForResizing() const;
     void setMinimumSizeForResizing(const LayoutSize&);
 
     virtual void didBecomeFullscreenElement() { }
     virtual void willStopBeingFullscreenElement() { }
 
+    // Called by the parser when this element's attributes have all been added.
+    // This is needed for <audio>/<video>, where the muted content attribute
+    // should have an effect only if it is present when the element is created.
+    virtual void finishParsingAttributes() { }
+
     // Called by the parser when this element's close tag is reached,
     // signaling that all child tags have been parsed and added.
     // This is needed for <applet> and <object> elements, which can't lay themselves out
     // until they know all of their nested <param>s. [Radar 3603191, 4040848].
     // Also used for script elements and some SVG elements for similar purposes,
     // but making parsing a special case in this respect should be avoided if possible.
     virtual void finishParsingChildren();
 
     void beginParsingChildren() { setIsFinishedParsingChildren(false); }
 
@@ skipping 460 matching lines @@
     template <> inline bool isElementOfType<const thisType>(const Element& element) { return element.predicate; } \
     DEFINE_NODE_TYPE_CASTS(thisType, predicate)
 
 #define DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(thisType) \
     template <> inline bool isElementOfType<const thisType>(const Element& element) { return is##thisType(element); } \
     DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION(thisType)
 
 } // namespace
 
 #endif