Don't report errors when SVG attributes are removed

third_party/WebKit/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 170 matching lines @@
         return false;
 
     // This is true whenever this is the outermost SVG, even if there are HTML elements outside it
     return !parentNode()->isSVGElement();
 }
 
 void SVGElement::reportAttributeParsingError(SVGParsingError error, const QualifiedName& name, const AtomicString& value)
 {
     if (error == SVGParseStatus::NoError)
         return;
+    // Don't report any errors on attribute removal.
+    if (value.isNull())
+        return;
     document().accessSVGExtensions().reportError(error.format(tagName(), name, value));
 }
 
 String SVGElement::title() const
 {
     // According to spec, we should not return titles when hovering over root <svg> elements (those
     // <title> elements are the title of the document, not a tooltip) so we instantly return.
     if (isOutermostSVGSVGElement())
         return String();
 
@@ skipping 1017 matching lines @@
     Element::trace(visitor);
 }
 
 const AtomicString& SVGElement::eventParameterName()
 {
     DEFINE_STATIC_LOCAL(const AtomicString, evtString, ("evt", AtomicString::ConstructFromLiteral));
     return evtString;
 }
 
 } // namespace blink