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

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

Index: client/dom/generated/src/frog/SVGFEColorMatrixElement.dart
diff --git a/client/dom/generated/src/frog/SVGFEColorMatrixElement.dart b/client/dom/generated/src/frog/SVGFEColorMatrixElement.dart
index 8594c349a5dcbfbbde07fb09c6ed184487e0f25e..94cd1cef2a3e0e33a8ae0540e91e5c113a6e1863 100644
--- a/client/dom/generated/src/frog/SVGFEColorMatrixElement.dart
+++ b/client/dom/generated/src/frog/SVGFEColorMatrixElement.dart
@@ -11,29 +11,29 @@ class _SVGFEColorMatrixElementJs extends _SVGElementJs implements SVGFEColorMatr
 
   static final int SVG_FECOLORMATRIX_TYPE_UNKNOWN = 0;
 
-  _SVGAnimatedStringJs get in1() native "return this.in1;";
+  final _SVGAnimatedStringJs in1;
 
-  _SVGAnimatedEnumerationJs get type() native "return this.type;";
+  final _SVGAnimatedEnumerationJs type;
 
-  _SVGAnimatedNumberListJs get values() native "return this.values;";
+  final _SVGAnimatedNumberListJs values;
 
   // 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;
 }