Remove support for the externalResourcesRequired attribute.

Source/core/svg/SVGFEImageElement.cpp

Index: Source/core/svg/SVGFEImageElement.cpp
diff --git a/Source/core/svg/SVGFEImageElement.cpp b/Source/core/svg/SVGFEImageElement.cpp
index e164c6595f9eae57131984d70631a6ea6331e396..190c591f995476bdb00a9a9f603bd7b5f328303e 100644
--- a/Source/core/svg/SVGFEImageElement.cpp
+++ b/Source/core/svg/SVGFEImageElement.cpp
@@ -39,12 +39,10 @@ namespace WebCore {
 // Animated property definitions
 DEFINE_ANIMATED_PRESERVEASPECTRATIO(SVGFEImageElement, SVGNames::preserveAspectRatioAttr, PreserveAspectRatio, preserveAspectRatio)
 DEFINE_ANIMATED_STRING(SVGFEImageElement, XLinkNames::hrefAttr, Href, href)
-DEFINE_ANIMATED_BOOLEAN(SVGFEImageElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
 
 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGFEImageElement)
     REGISTER_LOCAL_ANIMATED_PROPERTY(preserveAspectRatio)
     REGISTER_LOCAL_ANIMATED_PROPERTY(href)
-    REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired)
     REGISTER_PARENT_ANIMATED_PROPERTIES(SVGFilterPrimitiveStandardAttributes)
 END_REGISTER_ANIMATED_PROPERTIES
 
@@ -122,7 +120,6 @@ bool SVGFEImageElement::isSupportedAttribute(const QualifiedName& attrName)
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
         SVGURIReference::addSupportedAttributes(supportedAttributes);
-        SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
         supportedAttributes.add(SVGNames::preserveAspectRatioAttr);
     }
     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
@@ -144,8 +141,6 @@ void SVGFEImageElement::parseAttribute(const QualifiedName& name, const AtomicSt
 
     if (SVGURIReference::parseAttribute(name, value))
         return;
-    if (SVGExternalResourcesRequired::parseAttribute(name, value))
-        return;
 
     ASSERT_NOT_REACHED();
 }
@@ -169,9 +164,6 @@ void SVGFEImageElement::svgAttributeChanged(const QualifiedName& attrName)
         return;
     }
 
-    if (SVGExternalResourcesRequired::isKnownAttribute(attrName))
-        return;
-
     ASSERT_NOT_REACHED();
 }