Remove PostAttachCallbacks and replace with something more specialized

Source/core/svg/SVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * 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 97 matching lines @@
         // calling rebuildAllElementReferencesForTarget() and
         // removeAllElementReferencesForTarget() below.
         clearHasSVGRareData();
     }
     document().accessSVGExtensions().rebuildAllElementReferencesForTarget(this);
     document().accessSVGExtensions().removeAllElementReferencesForTarget(this);
 }
 
 void SVGElement::willRecalcStyle(StyleRecalcChange change)
 {
-    // FIXME: This assumes that when shouldNotifyRendererWithIdenticalStyles() is true
-    // the change came from a SMIL animation, but what if there were non-SMIL changes
-    // since then? I think we should remove the shouldNotifyRendererWithIdenticalStyles
-    // check.
-    if (!hasSVGRareData() || shouldNotifyRendererWithIdenticalStyles())
+    if (!hasSVGRareData())
         return;
     // If the style changes because of a regular property change (not induced by SMIL animations themselves)
     // reset the "computed style without SMIL style properties", so the base value change gets reflected.
     if (change > NoChange || needsStyleRecalc())
         svgRareData()->setNeedsOverrideComputedStyleUpdate();
 }
 
 void SVGElement::buildPendingResourcesIfNeeded()
 {
     Document& document = this->document();
@@ skipping 998 matching lines @@
         animatableAttributes.add(SVGNames::zAttr);
     }
 
     if (name == classAttr)
         return true;
 
     return animatableAttributes.contains(name);
 }
 #endif
 }