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

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

 
 class _SVGLengthJs extends _DOMTypeJs implements SVGLength native "*SVGLength" {
 
   static final int SVG_LENGTHTYPE_CM = 6;
 
   static final int SVG_LENGTHTYPE_EMS = 3;
 
   static final int SVG_LENGTHTYPE_EXS = 4;
 
   static final int SVG_LENGTHTYPE_IN = 8;
 
   static final int SVG_LENGTHTYPE_MM = 7;
 
   static final int SVG_LENGTHTYPE_NUMBER = 1;
 
   static final int SVG_LENGTHTYPE_PC = 10;
 
   static final int SVG_LENGTHTYPE_PERCENTAGE = 2;
 
   static final int SVG_LENGTHTYPE_PT = 9;
 
   static final int SVG_LENGTHTYPE_PX = 5;
 
   static final int SVG_LENGTHTYPE_UNKNOWN = 0;
 
-  int get unitType() native "return this.unitType;";
+  final int unitType;
 
-  num get value() native "return this.value;";
+  num value;
 
-  void set value(num value) native "this.value = value;";
+  String valueAsString;
 
-  String get valueAsString() native "return this.valueAsString;";
-
-  void set valueAsString(String value) native "this.valueAsString = value;";
-
-  num get valueInSpecifiedUnits() native "return this.valueInSpecifiedUnits;";
-
-  void set valueInSpecifiedUnits(num value) native "this.valueInSpecifiedUnits = value;";
+  num valueInSpecifiedUnits;
 
   void convertToSpecifiedUnits(int unitType) native;
 
   void newValueSpecifiedUnits(int unitType, num valueInSpecifiedUnits) native;
 }