Let SVGElement handle SVGLangSpace attributes parsing

Source/core/svg/SVGMaskElement.cpp

Index: Source/core/svg/SVGMaskElement.cpp
diff --git a/Source/core/svg/SVGMaskElement.cpp b/Source/core/svg/SVGMaskElement.cpp
index df455878c0de272fc4d4220e29dfac1ec57dc7d5..b73e82ec0b9fafbc31242661cb93116111919082 100644
--- a/Source/core/svg/SVGMaskElement.cpp
+++ b/Source/core/svg/SVGMaskElement.cpp
@@ -79,7 +79,6 @@ bool SVGMaskElement::isSupportedAttribute(const QualifiedName& attrName)
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
         SVGTests::addSupportedAttributes(supportedAttributes);
-        SVGLangSpace::addSupportedAttributes(supportedAttributes);
         SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
         supportedAttributes.add(SVGNames::maskUnitsAttr);
         supportedAttributes.add(SVGNames::maskContentUnitsAttr);
@@ -116,7 +115,6 @@ void SVGMaskElement::parseAttribute(const QualifiedName& name, const AtomicStrin
     else if (name == SVGNames::heightAttr)
         setHeightBaseValue(SVGLength::construct(LengthModeHeight, value, parseError));
     else if (SVGTests::parseAttribute(name, value)
-             || SVGLangSpace::parseAttribute(name, value)
              || SVGExternalResourcesRequired::parseAttribute(name, value)) {
     } else
         ASSERT_NOT_REACHED();