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

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

Index: client/dom/generated/src/frog/SVGFEDisplacementMapElement.dart
diff --git a/client/dom/generated/src/frog/SVGFEDisplacementMapElement.dart b/client/dom/generated/src/frog/SVGFEDisplacementMapElement.dart
index fdae525ea5bb8fbe1d747b00f7a82f914547d00a..0d1f1cbf588a67b9a6b5e15451b49679b097135e 100644
--- a/client/dom/generated/src/frog/SVGFEDisplacementMapElement.dart
+++ b/client/dom/generated/src/frog/SVGFEDisplacementMapElement.dart
@@ -11,33 +11,33 @@ class _SVGFEDisplacementMapElementJs extends _SVGElementJs implements SVGFEDispl
 
   static final int SVG_CHANNEL_UNKNOWN = 0;
 
-  _SVGAnimatedStringJs get in1() native "return this.in1;";
+  final _SVGAnimatedStringJs in1;
 
-  _SVGAnimatedStringJs get in2() native "return this.in2;";
+  final _SVGAnimatedStringJs in2;
 
-  _SVGAnimatedNumberJs get scale() native "return this.scale;";
+  final _SVGAnimatedNumberJs scale;
 
-  _SVGAnimatedEnumerationJs get xChannelSelector() native "return this.xChannelSelector;";
+  final _SVGAnimatedEnumerationJs xChannelSelector;
 
-  _SVGAnimatedEnumerationJs get yChannelSelector() native "return this.yChannelSelector;";
+  final _SVGAnimatedEnumerationJs yChannelSelector;
 
   // From SVGFilterPrimitiveStandardAttributes
 
-  _SVGAnimatedLengthJs get height() native "return this.height;";
+  final _SVGAnimatedLengthJs height;
 
-  _SVGAnimatedStringJs get result() native "return this.result;";
+  final _SVGAnimatedStringJs result;
 
-  _SVGAnimatedLengthJs get width() native "return this.width;";
+  final _SVGAnimatedLengthJs width;
 
-  _SVGAnimatedLengthJs get x() native "return this.x;";
+  final _SVGAnimatedLengthJs x;
 
-  _SVGAnimatedLengthJs get y() native "return this.y;";
+  final _SVGAnimatedLengthJs y;
 
   // From SVGStylable
 
-  _SVGAnimatedStringJs get className() native "return this.className;";
+  final _SVGAnimatedStringJs className;
 
-  _CSSStyleDeclarationJs get style() native "return this.style;";
+  final _CSSStyleDeclarationJs style;
 
   _CSSValueJs getPresentationAttribute(String name) native;
 }