Remove some dead code in SVG "mixins"

third_party/WebKit/Source/core/svg/SVGAnimationElement.h

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Cameron McCormack <cam@mcc.id.au>
  * Copyright (C) Research In Motion Limited 2011. 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
@@ skipping 160 matching lines @@
     void setCalcMode(CalcMode calcMode) { m_calcMode = calcMode; }
 
     // Parses a list of values as specified by SVG, stripping leading
     // and trailing whitespace, and places them in result. If the
     // format of the string is not valid, parseValues empties result
     // and returns false. See
     // http://www.w3.org/TR/SVG/animate.html#ValuesAttribute .
     static bool parseValues(const String&, Vector<String>& result);
 
 private:
-    bool isValid() const final { return SVGTests::isValid(document()); }
+    bool isValid() const final { return SVGTests::isValid(); }
 
     void animationAttributeChanged() override;
     void setAttributeType(const AtomicString&);
 
     void checkInvalidCSSAttributeType();
 
     virtual bool calculateToAtEndOfDurationValue(const String& toAtEndOfDurationString) = 0;
     virtual bool calculateFromAndToValues(const String& fromString, const String& toString) = 0;
     virtual bool calculateFromAndByValues(const String& fromString, const String& byString) = 0;
     virtual void calculateAnimatedValue(float percent, unsigned repeatCount, SVGSMILElement* resultElement) = 0;
@@ skipping 24 matching lines @@
     String m_lastValuesAnimationFrom;
     String m_lastValuesAnimationTo;
     bool m_hasInvalidCSSAttributeType;
     CalcMode m_calcMode;
     AnimationMode m_animationMode;
 };
 
 } // namespace blink
 
 #endif // SVGAnimationElement_h