Remove support for the externalResourcesRequired attribute.

Source/core/svg/SVGRectElement.cpp

Index: Source/core/svg/SVGRectElement.cpp
diff --git a/Source/core/svg/SVGRectElement.cpp b/Source/core/svg/SVGRectElement.cpp
index 2f0e12c0b97138a8239d54120f7474816fb7bfb8..a87cbc9af302ad36ecfbbf3862af17be8afb742b 100644
--- a/Source/core/svg/SVGRectElement.cpp
+++ b/Source/core/svg/SVGRectElement.cpp
@@ -37,7 +37,6 @@ DEFINE_ANIMATED_LENGTH(SVGRectElement, SVGNames::widthAttr, Width, width)
 DEFINE_ANIMATED_LENGTH(SVGRectElement, SVGNames::heightAttr, Height, height)
 DEFINE_ANIMATED_LENGTH(SVGRectElement, SVGNames::rxAttr, Rx, rx)
 DEFINE_ANIMATED_LENGTH(SVGRectElement, SVGNames::ryAttr, Ry, ry)
-DEFINE_ANIMATED_BOOLEAN(SVGRectElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
 
 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGRectElement)
     REGISTER_LOCAL_ANIMATED_PROPERTY(x)
@@ -46,7 +45,6 @@ BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGRectElement)
     REGISTER_LOCAL_ANIMATED_PROPERTY(height)
     REGISTER_LOCAL_ANIMATED_PROPERTY(rx)
     REGISTER_LOCAL_ANIMATED_PROPERTY(ry)
-    REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired)
     REGISTER_PARENT_ANIMATED_PROPERTIES(SVGGraphicsElement)
 END_REGISTER_ANIMATED_PROPERTIES
 
@@ -74,7 +72,6 @@ bool SVGRectElement::isSupportedAttribute(const QualifiedName& attrName)
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
         SVGLangSpace::addSupportedAttributes(supportedAttributes);
-        SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
         supportedAttributes.add(SVGNames::xAttr);
         supportedAttributes.add(SVGNames::yAttr);
         supportedAttributes.add(SVGNames::widthAttr);
@@ -103,8 +100,7 @@ void SVGRectElement::parseAttribute(const QualifiedName& name, const AtomicStrin
         setWidthBaseValue(SVGLength::construct(LengthModeWidth, value, parseError, ForbidNegativeLengths));
     else if (name == SVGNames::heightAttr)
         setHeightBaseValue(SVGLength::construct(LengthModeHeight, value, parseError, ForbidNegativeLengths));
-    else if (SVGLangSpace::parseAttribute(name, value)
-             || SVGExternalResourcesRequired::parseAttribute(name, value)) {
+    else if (SVGLangSpace::parseAttribute(name, value)) {
     } else
         ASSERT_NOT_REACHED();
 
@@ -140,7 +136,7 @@ void SVGRectElement::svgAttributeChanged(const QualifiedName& attrName)
         return;
     }
 
-    if (SVGLangSpace::isKnownAttribute(attrName) || SVGExternalResourcesRequired::isKnownAttribute(attrName)) {
+    if (SVGLangSpace::isKnownAttribute(attrName)) {
         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
         return;
     }