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

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

 
 class _WebGLContextAttributesJs extends _DOMTypeJs implements WebGLContextAttributes native "*WebGLContextAttributes" {
 
-  bool get alpha() native "return this.alpha;";
+  bool alpha;
 
-  void set alpha(bool value) native "this.alpha = value;";
+  bool antialias;
 
-  bool get antialias() native "return this.antialias;";
+  bool depth;
 
-  void set antialias(bool value) native "this.antialias = value;";
+  bool premultipliedAlpha;
 
-  bool get depth() native "return this.depth;";
+  bool preserveDrawingBuffer;
 
-  void set depth(bool value) native "this.depth = value;";
-
-  bool get premultipliedAlpha() native "return this.premultipliedAlpha;";
-
-  void set premultipliedAlpha(bool value) native "this.premultipliedAlpha = value;";
-
-  bool get preserveDrawingBuffer() native "return this.preserveDrawingBuffer;";
-
-  void set preserveDrawingBuffer(bool value) native "this.preserveDrawingBuffer = value;";
-
-  bool get stencil() native "return this.stencil;";
-
-  void set stencil(bool value) native "this.stencil = value;";
+  bool stencil;
 }