Remove support for the externalResourcesRequired attribute.

Source/core/svg/SVGPathElement.h

Index: Source/core/svg/SVGPathElement.h
diff --git a/Source/core/svg/SVGPathElement.h b/Source/core/svg/SVGPathElement.h
index 766dd1d25090349519719829cd3d303f44a9d1fb..3d1eeba1bde1deae79d71786340d9af6751e3dd8 100644
--- a/Source/core/svg/SVGPathElement.h
+++ b/Source/core/svg/SVGPathElement.h
@@ -24,7 +24,6 @@
 #include "SVGNames.h"
 #include "core/svg/SVGAnimatedBoolean.h"
 #include "core/svg/SVGAnimatedNumber.h"
-#include "core/svg/SVGExternalResourcesRequired.h"
 #include "core/svg/SVGGraphicsElement.h"
 #include "core/svg/SVGPathByteStream.h"
 #include "core/svg/SVGPathSegList.h"
@@ -52,8 +51,7 @@ class SVGPathSegCurvetoQuadraticSmoothAbs;
 class SVGPathSegCurvetoQuadraticSmoothRel;
 class SVGPathSegListPropertyTearOff;
 
-class SVGPathElement FINAL : public SVGGraphicsElement,
-                             public SVGExternalResourcesRequired {
+class SVGPathElement FINAL : public SVGGraphicsElement {
 public:
     static PassRefPtr<SVGPathElement> create(const QualifiedName&, Document&);
 
@@ -114,7 +112,6 @@ private:
 
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGPathElement)
         DECLARE_ANIMATED_NUMBER(PathLength, pathLength)
-        DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)
     END_DECLARE_ANIMATED_PROPERTIES
 
     virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;