Count internal use of DOMImplementation::hasFeature() returning false

Source/core/svg/SVGGraphicsElement.h

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2014 Google, Inc.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 43 matching lines @@
     AffineTransform calculateAnimatedLocalTransform() const;
     virtual AffineTransform* animateMotionTransform() override;
 
     virtual FloatRect getBBox();
     PassRefPtr<SVGRectTearOff> getBBoxFromJavascript();
 
     // "base class" methods for all the elements which render as paths
     virtual void toClipPath(Path&);
     virtual RenderObject* createRenderer(RenderStyle*) override;
 
-    virtual bool isValid() const override final { return SVGTests::isValid(); }
+    virtual bool isValid() const override final { return SVGTests::isValid(document()); }
 
     SVGAnimatedTransformList* transform() { return m_transform.get(); }
     const SVGAnimatedTransformList* transform() const { return m_transform.get(); }
 
     AffineTransform computeCTM(SVGElement::CTMScope mode, SVGGraphicsElement::StyleUpdateStrategy,
         const SVGGraphicsElement* ancestor = 0) const;
 
 protected:
     SVGGraphicsElement(const QualifiedName&, Document&, ConstructionType = CreateSVGElement);
 
@@ skipping 12 matching lines @@
 inline bool isSVGGraphicsElement(const SVGElement& element)
 {
     return element.isSVGGraphicsElement();
 }
 
 DEFINE_SVGELEMENT_TYPE_CASTS_WITH_FUNCTION(SVGGraphicsElement);
 
 } // namespace blink
 
 #endif // SVGGraphicsElement_h