Use fields in hidden native DOM classes instead of getters/setters.

client/dom/generated/src/frog/SVGFESpotLightElement.dart

Index: client/dom/generated/src/frog/SVGFESpotLightElement.dart
diff --git a/client/dom/generated/src/frog/SVGFESpotLightElement.dart b/client/dom/generated/src/frog/SVGFESpotLightElement.dart
index e75b9c67b0e2ed01e86028ba0248ddfa7a994370..ec338b44117504b237cd6af1df62e535e4588fbf 100644
--- a/client/dom/generated/src/frog/SVGFESpotLightElement.dart
+++ b/client/dom/generated/src/frog/SVGFESpotLightElement.dart
@@ -1,19 +1,19 @@
 
 class _SVGFESpotLightElementJs extends _SVGElementJs implements SVGFESpotLightElement native "*SVGFESpotLightElement" {
 
-  _SVGAnimatedNumberJs get limitingConeAngle() native "return this.limitingConeAngle;";
+  final _SVGAnimatedNumberJs limitingConeAngle;
 
-  _SVGAnimatedNumberJs get pointsAtX() native "return this.pointsAtX;";
+  final _SVGAnimatedNumberJs pointsAtX;
 
-  _SVGAnimatedNumberJs get pointsAtY() native "return this.pointsAtY;";
+  final _SVGAnimatedNumberJs pointsAtY;
 
-  _SVGAnimatedNumberJs get pointsAtZ() native "return this.pointsAtZ;";
+  final _SVGAnimatedNumberJs pointsAtZ;
 
-  _SVGAnimatedNumberJs get specularExponent() native "return this.specularExponent;";
+  final _SVGAnimatedNumberJs specularExponent;
 
-  _SVGAnimatedNumberJs get x() native "return this.x;";
+  final _SVGAnimatedNumberJs x;
 
-  _SVGAnimatedNumberJs get y() native "return this.y;";
+  final _SVGAnimatedNumberJs y;
 
-  _SVGAnimatedNumberJs get z() native "return this.z;";
+  final _SVGAnimatedNumberJs z;
 }