Remove support for the externalResourcesRequired attribute.

Source/core/svg/SVGEllipseElement.h

Index: Source/core/svg/SVGEllipseElement.h
diff --git a/Source/core/svg/SVGEllipseElement.h b/Source/core/svg/SVGEllipseElement.h
index 1c34b9b4ccc0f866b1ace0f81c5fda445bb79c1f..9a069c06f502ee8d9889a3bfae2887b90eb2355a 100644
--- a/Source/core/svg/SVGEllipseElement.h
+++ b/Source/core/svg/SVGEllipseElement.h
@@ -24,13 +24,11 @@
 #include "SVGNames.h"
 #include "core/svg/SVGAnimatedBoolean.h"
 #include "core/svg/SVGAnimatedLength.h"
-#include "core/svg/SVGExternalResourcesRequired.h"
 #include "core/svg/SVGGraphicsElement.h"
 
 namespace WebCore {
 
-class SVGEllipseElement FINAL : public SVGGraphicsElement,
-                                public SVGExternalResourcesRequired {
+class SVGEllipseElement FINAL : public SVGGraphicsElement {
 public:
     static PassRefPtr<SVGEllipseElement> create(const QualifiedName&, Document&);
 
@@ -53,7 +51,6 @@ private:
         DECLARE_ANIMATED_LENGTH(Cy, cy)
         DECLARE_ANIMATED_LENGTH(Rx, rx)
         DECLARE_ANIMATED_LENGTH(Ry, ry)
-        DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)
     END_DECLARE_ANIMATED_PROPERTIES
 };