Remove support for the externalResourcesRequired attribute.

Source/core/svg/SVGForeignObjectElement.cpp

Index: Source/core/svg/SVGForeignObjectElement.cpp
diff --git a/Source/core/svg/SVGForeignObjectElement.cpp b/Source/core/svg/SVGForeignObjectElement.cpp
index e8a99a2b701716f0a75d5df8a3391af0a3d5b125..c75e431dafd6a85f969709233f435dbcac395923 100644
--- a/Source/core/svg/SVGForeignObjectElement.cpp
+++ b/Source/core/svg/SVGForeignObjectElement.cpp
@@ -37,7 +37,6 @@ DEFINE_ANIMATED_LENGTH(SVGForeignObjectElement, SVGNames::yAttr, Y, y)
 DEFINE_ANIMATED_LENGTH(SVGForeignObjectElement, SVGNames::widthAttr, Width, width)
 DEFINE_ANIMATED_LENGTH(SVGForeignObjectElement, SVGNames::heightAttr, Height, height)
 DEFINE_ANIMATED_STRING(SVGForeignObjectElement, XLinkNames::hrefAttr, Href, href)
-DEFINE_ANIMATED_BOOLEAN(SVGForeignObjectElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
 
 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGForeignObjectElement)
     REGISTER_LOCAL_ANIMATED_PROPERTY(x)
@@ -45,7 +44,6 @@ BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGForeignObjectElement)
     REGISTER_LOCAL_ANIMATED_PROPERTY(width)
     REGISTER_LOCAL_ANIMATED_PROPERTY(height)
     REGISTER_LOCAL_ANIMATED_PROPERTY(href)
-    REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired)
     REGISTER_PARENT_ANIMATED_PROPERTIES(SVGGraphicsElement)
 END_REGISTER_ANIMATED_PROPERTIES
 
@@ -70,7 +68,6 @@ bool SVGForeignObjectElement::isSupportedAttribute(const QualifiedName& attrName
 {
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
-        SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
         supportedAttributes.add(SVGNames::xAttr);
         supportedAttributes.add(SVGNames::yAttr);
         supportedAttributes.add(SVGNames::widthAttr);
@@ -93,8 +90,7 @@ void SVGForeignObjectElement::parseAttribute(const QualifiedName& name, const At
         setWidthBaseValue(SVGLength::construct(LengthModeWidth, value, parseError));
     else if (name == SVGNames::heightAttr)
         setHeightBaseValue(SVGLength::construct(LengthModeHeight, value, parseError));
-    else if (SVGExternalResourcesRequired::parseAttribute(name, value)) {
-    } else
+    else
         ASSERT_NOT_REACHED();
 
     reportAttributeParsingError(parseError, name, value);