Remove support for the externalResourcesRequired attribute.

Source/core/svg/SVGMPathElement.cpp

Index: Source/core/svg/SVGMPathElement.cpp
diff --git a/Source/core/svg/SVGMPathElement.cpp b/Source/core/svg/SVGMPathElement.cpp
index b766818f4755a0001bb4e8a3a8dc5228ac996992..7a47bc76009cf5b27f8ca39ceee0dcbb1da66cb9 100644
--- a/Source/core/svg/SVGMPathElement.cpp
+++ b/Source/core/svg/SVGMPathElement.cpp
@@ -32,11 +32,9 @@ namespace WebCore {
 
 // Animated property definitions
 DEFINE_ANIMATED_STRING(SVGMPathElement, XLinkNames::hrefAttr, Href, href)
-DEFINE_ANIMATED_BOOLEAN(SVGMPathElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
 
 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGMPathElement)
     REGISTER_LOCAL_ANIMATED_PROPERTY(href)
-    REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired)
 END_REGISTER_ANIMATED_PROPERTIES
 
 inline SVGMPathElement::SVGMPathElement(const QualifiedName& tagName, Document& document)
@@ -109,7 +107,6 @@ bool SVGMPathElement::isSupportedAttribute(const QualifiedName& attrName)
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
         SVGURIReference::addSupportedAttributes(supportedAttributes);
-        SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
     }
     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
 }
@@ -123,8 +120,6 @@ void SVGMPathElement::parseAttribute(const QualifiedName& name, const AtomicStri
 
     if (SVGURIReference::parseAttribute(name, value))
         return;
-    if (SVGExternalResourcesRequired::parseAttribute(name, value))
-        return;
 
     ASSERT_NOT_REACHED();
 }
@@ -143,9 +138,6 @@ void SVGMPathElement::svgAttributeChanged(const QualifiedName& attrName)
         return;
     }
 
-    if (SVGExternalResourcesRequired::isKnownAttribute(attrName))
-        return;
-
     ASSERT_NOT_REACHED();
 }