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

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

Index: client/dom/generated/src/frog/SVGPolygonElement.dart
diff --git a/client/dom/generated/src/frog/SVGPolygonElement.dart b/client/dom/generated/src/frog/SVGPolygonElement.dart
index 8ef7b10153e0aa4960a9b1628c61e934bd5fc1bd..57fcf14fa47f1a51d4121b6b6a57b29d44eee43b 100644
--- a/client/dom/generated/src/frog/SVGPolygonElement.dart
+++ b/client/dom/generated/src/frog/SVGPolygonElement.dart
@@ -1,51 +1,47 @@
 
 class _SVGPolygonElementJs extends _SVGElementJs implements SVGPolygonElement native "*SVGPolygonElement" {
 
-  _SVGPointListJs get animatedPoints() native "return this.animatedPoints;";
+  final _SVGPointListJs animatedPoints;
 
-  _SVGPointListJs get points() native "return this.points;";
+  final _SVGPointListJs points;
 
   // From SVGTests
 
-  _SVGStringListJs get requiredExtensions() native "return this.requiredExtensions;";
+  final _SVGStringListJs requiredExtensions;
 
-  _SVGStringListJs get requiredFeatures() native "return this.requiredFeatures;";
+  final _SVGStringListJs requiredFeatures;
 
-  _SVGStringListJs get systemLanguage() native "return this.systemLanguage;";
+  final _SVGStringListJs systemLanguage;
 
   bool hasExtension(String extension) native;
 
   // From SVGLangSpace
 
-  String get xmllang() native "return this.xmllang;";
+  String xmllang;
 
-  void set xmllang(String value) native "this.xmllang = value;";
-
-  String get xmlspace() native "return this.xmlspace;";
-
-  void set xmlspace(String value) native "this.xmlspace = value;";
+  String xmlspace;
 
   // From SVGExternalResourcesRequired
 
-  _SVGAnimatedBooleanJs get externalResourcesRequired() native "return this.externalResourcesRequired;";
+  final _SVGAnimatedBooleanJs externalResourcesRequired;
 
   // 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;
 
   // From SVGTransformable
 
-  _SVGAnimatedTransformListJs get transform() native "return this.transform;";
+  final _SVGAnimatedTransformListJs transform;
 
   // From SVGLocatable
 
-  _SVGElementJs get farthestViewportElement() native "return this.farthestViewportElement;";
+  final _SVGElementJs farthestViewportElement;
 
-  _SVGElementJs get nearestViewportElement() native "return this.nearestViewportElement;";
+  final _SVGElementJs nearestViewportElement;
 
   _SVGRectJs getBBox() native;