Remove support for the externalResourcesRequired attribute.

Source/core/svg/SVGPathElement.cpp

Index: Source/core/svg/SVGPathElement.cpp
diff --git a/Source/core/svg/SVGPathElement.cpp b/Source/core/svg/SVGPathElement.cpp
index 33b20a236d94510cf834543ad1056e99e7fac4e8..f01c0ef5bf6c398dc93a98e51e0491b4804d8049 100644
--- a/Source/core/svg/SVGPathElement.cpp
+++ b/Source/core/svg/SVGPathElement.cpp
@@ -69,12 +69,10 @@ const SVGPropertyInfo* SVGPathElement::dPropertyInfo()
 
 // Animated property definitions
 DEFINE_ANIMATED_NUMBER(SVGPathElement, SVGNames::pathLengthAttr, PathLength, pathLength)
-DEFINE_ANIMATED_BOOLEAN(SVGPathElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
 
 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGPathElement)
     REGISTER_LOCAL_ANIMATED_PROPERTY(d)
     REGISTER_LOCAL_ANIMATED_PROPERTY(pathLength)
-    REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired)
     REGISTER_PARENT_ANIMATED_PROPERTIES(SVGGraphicsElement)
 END_REGISTER_ANIMATED_PROPERTIES
 
@@ -214,7 +212,6 @@ bool SVGPathElement::isSupportedAttribute(const QualifiedName& attrName)
 {
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
-        SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
         supportedAttributes.add(SVGNames::dAttr);
         supportedAttributes.add(SVGNames::pathLengthAttr);
     }
@@ -241,9 +238,6 @@ void SVGPathElement::parseAttribute(const QualifiedName& name, const AtomicStrin
         return;
     }
 
-    if (SVGExternalResourcesRequired::parseAttribute(name, value))
-        return;
-
     ASSERT_NOT_REACHED();
 }