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 61c539edf11bcd63234ba9096c14ac417b42ae60..6f3377f0080b1498e61281b80057de8435c59960 100644
--- a/Source/core/svg/SVGRectElement.cpp
+++ b/Source/core/svg/SVGRectElement.cpp
@@ -36,7 +36,6 @@ 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)
@@ -45,7 +44,6 @@ 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
 
@@ -71,7 +69,6 @@ bool SVGRectElement::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);
@@ -100,8 +97,7 @@ 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 (SVGExternalResourcesRequired::parseAttribute(name, value)) {
-    } else
+    else
         ASSERT_NOT_REACHED();
 
     reportAttributeParsingError(parseError, name, value);
@@ -136,11 +132,6 @@ void SVGRectElement::svgAttributeChanged(const QualifiedName& attrName)
         return;
     }
 
-    if (SVGExternalResourcesRequired::isKnownAttribute(attrName)) {
-        RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
-        return;
-    }
-
     ASSERT_NOT_REACHED();
 }