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

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

Index: client/dom/generated/src/frog/SVGMatrix.dart
diff --git a/client/dom/generated/src/frog/SVGMatrix.dart b/client/dom/generated/src/frog/SVGMatrix.dart
index db85a1aeda226842561e782167102530637d8705..d73fe9488668bc2c79984a6eaab1e44ee2491105 100644
--- a/client/dom/generated/src/frog/SVGMatrix.dart
+++ b/client/dom/generated/src/frog/SVGMatrix.dart
@@ -1,29 +1,17 @@
 
 class _SVGMatrixJs extends _DOMTypeJs implements SVGMatrix native "*SVGMatrix" {
 
-  num get a() native "return this.a;";
+  num a;
 
-  void set a(num value) native "this.a = value;";
+  num b;
 
-  num get b() native "return this.b;";
+  num c;
 
-  void set b(num value) native "this.b = value;";
+  num d;
 
-  num get c() native "return this.c;";
+  num e;
 
-  void set c(num value) native "this.c = value;";
-
-  num get d() native "return this.d;";
-
-  void set d(num value) native "this.d = value;";
-
-  num get e() native "return this.e;";
-
-  void set e(num value) native "this.e = value;";
-
-  num get f() native "return this.f;";
-
-  void set f(num value) native "this.f = value;";
+  num f;
 
   _SVGMatrixJs flipX() native;