Remove Attr.isId and Attr.ownerElement.

Source/core/frame/UseCounter.h

 /*
  * Copyright (C) 2012 Google, 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 200 matching lines @@
         DocumentAllTags,
         DocumentAllLegacyCall,
         HTMLAppletElementLegacyCall,
         HTMLEmbedElementLegacyCall,
         HTMLObjectElementLegacyCall,
         BeforeLoadEvent,
         GetMatchedCSSRules,
         SVGFontInCSS,
         ScrollTopBodyNotQuirksMode,
         ScrollLeftBodyNotQuirksMode,
-        AttributeIsId, // Removed in DOM4.
-        AttributeOwnerElement, // Removed in DOM4.
+        UnusedSlot07, // Removed, was Attr.isId.
+        UnusedSlot08, // Removed, was Attr.ownerElement.
         AttributeSetPrefix, // Attribute prefix is readonly in DOM4.
         AttributeSpecified, // Removed in DOM4.
         BeforeLoadEventInIsolatedWorld,
         PrefixedAudioDecodedByteCount,
         PrefixedVideoDecodedByteCount,
         PrefixedVideoSupportsFullscreen,
         PrefixedVideoDisplayingFullscreen,
         PrefixedVideoEnterFullscreen,
         PrefixedVideoExitFullscreen,
         PrefixedVideoEnterFullScreen,
@@ skipping 99 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace WebCore
 
 #endif // UseCounter_h