Remove support for the externalResourcesRequired attribute.

Source/core/svg/SVGCircleElement.cpp

Index: Source/core/svg/SVGCircleElement.cpp
diff --git a/Source/core/svg/SVGCircleElement.cpp b/Source/core/svg/SVGCircleElement.cpp
index 8852d8c33af7b859e0e5d3f68b7ee307b8531316..bbac41836dd8849b2b2242c5436635a0bebed56a 100644
--- a/Source/core/svg/SVGCircleElement.cpp
+++ b/Source/core/svg/SVGCircleElement.cpp
@@ -34,13 +34,11 @@ namespace WebCore {
 DEFINE_ANIMATED_LENGTH(SVGCircleElement, SVGNames::cxAttr, Cx, cx)
 DEFINE_ANIMATED_LENGTH(SVGCircleElement, SVGNames::cyAttr, Cy, cy)
 DEFINE_ANIMATED_LENGTH(SVGCircleElement, SVGNames::rAttr, R, r)
-DEFINE_ANIMATED_BOOLEAN(SVGCircleElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
 
 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGCircleElement)
     REGISTER_LOCAL_ANIMATED_PROPERTY(cx)
     REGISTER_LOCAL_ANIMATED_PROPERTY(cy)
     REGISTER_LOCAL_ANIMATED_PROPERTY(r)
-    REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired)
     REGISTER_PARENT_ANIMATED_PROPERTIES(SVGGraphicsElement)
 END_REGISTER_ANIMATED_PROPERTIES
 
@@ -65,7 +63,6 @@ bool SVGCircleElement::isSupportedAttribute(const QualifiedName& attrName)
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
         SVGLangSpace::addSupportedAttributes(supportedAttributes);
-        SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
         supportedAttributes.add(SVGNames::cxAttr);
         supportedAttributes.add(SVGNames::cyAttr);
         supportedAttributes.add(SVGNames::rAttr);
@@ -85,8 +82,7 @@ void SVGCircleElement::parseAttribute(const QualifiedName& name, const AtomicStr
         setCyBaseValue(SVGLength::construct(LengthModeHeight, value, parseError));
     else if (name == SVGNames::rAttr)
         setRBaseValue(SVGLength::construct(LengthModeOther, value, parseError, ForbidNegativeLengths));
-    else if (SVGLangSpace::parseAttribute(name, value)
-             || SVGExternalResourcesRequired::parseAttribute(name, value)) {
+    else if (SVGLangSpace::parseAttribute(name, value)) {
     } else
         ASSERT_NOT_REACHED();
 
@@ -119,7 +115,7 @@ void SVGCircleElement::svgAttributeChanged(const QualifiedName& attrName)
         return;
     }
 
-    if (SVGLangSpace::isKnownAttribute(attrName) || SVGExternalResourcesRequired::isKnownAttribute(attrName)) {
+    if (SVGLangSpace::isKnownAttribute(attrName)) {
         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
         return;
     }