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 e1d6ba3bb6d1a1ac0571f2865341c9d0ee569e2a..93a899cc557a205110d1f4fd7cec8370a1d1f251 100644
--- a/Source/core/svg/SVGCircleElement.cpp
+++ b/Source/core/svg/SVGCircleElement.cpp
@@ -33,13 +33,11 @@ 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
 
@@ -62,7 +60,6 @@ bool SVGCircleElement::isSupportedAttribute(const QualifiedName& attrName)
 {
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
-        SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
         supportedAttributes.add(SVGNames::cxAttr);
         supportedAttributes.add(SVGNames::cyAttr);
         supportedAttributes.add(SVGNames::rAttr);
@@ -82,8 +79,7 @@ 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 (SVGExternalResourcesRequired::parseAttribute(name, value)) {
-    } else
+    else
         ASSERT_NOT_REACHED();
 
     reportAttributeParsingError(parseError, name, value);
@@ -115,11 +111,6 @@ void SVGCircleElement::svgAttributeChanged(const QualifiedName& attrName)
         return;
     }
 
-    if (SVGExternalResourcesRequired::isKnownAttribute(attrName)) {
-        RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
-        return;
-    }
-
     ASSERT_NOT_REACHED();
 }