Remove support for the externalResourcesRequired attribute.

Source/core/svg/SVGPolyElement.cpp

Index: Source/core/svg/SVGPolyElement.cpp
diff --git a/Source/core/svg/SVGPolyElement.cpp b/Source/core/svg/SVGPolyElement.cpp
index a6eec9b2fd59e78664fefcca8d4b939c22e213a5..16e777a7bd6888e7dca3df464b9bf3677742561a 100644
--- a/Source/core/svg/SVGPolyElement.cpp
+++ b/Source/core/svg/SVGPolyElement.cpp
@@ -47,11 +47,9 @@ const SVGPropertyInfo* SVGPolyElement::pointsPropertyInfo()
 }
 
 // Animated property definitions
-DEFINE_ANIMATED_BOOLEAN(SVGPolyElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
 
 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGPolyElement)
     REGISTER_LOCAL_ANIMATED_PROPERTY(points)
-    REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired)
     REGISTER_PARENT_ANIMATED_PROPERTIES(SVGGraphicsElement)
 END_REGISTER_ANIMATED_PROPERTIES
 
@@ -66,7 +64,6 @@ bool SVGPolyElement::isSupportedAttribute(const QualifiedName& attrName)
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
         SVGLangSpace::addSupportedAttributes(supportedAttributes);
-        SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
         supportedAttributes.add(SVGNames::pointsAttr);
     }
     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
@@ -93,8 +90,6 @@ void SVGPolyElement::parseAttribute(const QualifiedName& name, const AtomicStrin
 
     if (SVGLangSpace::parseAttribute(name, value))
         return;
-    if (SVGExternalResourcesRequired::parseAttribute(name, value))
-        return;
 
     ASSERT_NOT_REACHED();
 }
@@ -118,7 +113,7 @@ void SVGPolyElement::svgAttributeChanged(const QualifiedName& attrName)
         return;
     }
 
-    if (SVGLangSpace::isKnownAttribute(attrName) || SVGExternalResourcesRequired::isKnownAttribute(attrName)) {
+    if (SVGLangSpace::isKnownAttribute(attrName)) {
         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
         return;
     }