Resolve light-source position/direction when updated

Source/core/svg/SVGFESpotLightElement.cpp

Index: Source/core/svg/SVGFESpotLightElement.cpp
diff --git a/Source/core/svg/SVGFESpotLightElement.cpp b/Source/core/svg/SVGFESpotLightElement.cpp
index 8d1d081fbae46871245c0e0702651a91fdff8677..84ecb847609c861366caa7cb1e424e8030f2c2c7 100644
--- a/Source/core/svg/SVGFESpotLightElement.cpp
+++ b/Source/core/svg/SVGFESpotLightElement.cpp
@@ -36,10 +36,7 @@ DEFINE_NODE_FACTORY(SVGFESpotLightElement)
 
 PassRefPtr<LightSource> SVGFESpotLightElement::lightSource(Filter* filter) const
 {
-    FloatPoint3D pos(x()->currentValue()->value(), y()->currentValue()->value(), z()->currentValue()->value());
-    FloatPoint3D direction(pointsAtX()->currentValue()->value(), pointsAtY()->currentValue()->value(), pointsAtZ()->currentValue()->value());
-
-    return SpotLightSource::create(filter->resolve3dPoint(pos), filter->resolve3dPoint(direction), specularExponent()->currentValue()->value(), limitingConeAngle()->currentValue()->value());
+    return SpotLightSource::create(filter->resolve3dPoint(position()), filter->resolve3dPoint(pointsAt()), specularExponent()->currentValue()->value(), limitingConeAngle()->currentValue()->value());
 }
 
 }