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

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

Index: client/dom/generated/src/frog/SVGFEFloodElement.dart
diff --git a/client/dom/generated/src/frog/SVGFEFloodElement.dart b/client/dom/generated/src/frog/SVGFEFloodElement.dart
index 91f6e8702fa89a80f1ef5462cef0d8ae225e7d6c..55a337eb1b9b5dc7c9d90afa7ce0a68c6319a839 100644
--- a/client/dom/generated/src/frog/SVGFEFloodElement.dart
+++ b/client/dom/generated/src/frog/SVGFEFloodElement.dart
@@ -3,21 +3,21 @@ class _SVGFEFloodElementJs extends _SVGElementJs implements SVGFEFloodElement na
 
   // 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;
 }