fixes #52, fields shadowing getters/setters or other fields

test/codegen/expect/sunflower/dom.js

Index: test/codegen/expect/sunflower/dom.js
diff --git a/test/codegen/expect/sunflower/dom.js b/test/codegen/expect/sunflower/dom.js
index accd3b1e5ea0bec03a406ba4626e23aeeb2bd8d0..ca8cd360c9f5d9a5d66edd34d1c59130a8d3cb4c 100644
--- a/test/codegen/expect/sunflower/dom.js
+++ b/test/codegen/expect/sunflower/dom.js
@@ -4,7 +4,7 @@ var dom;
   class JsName extends core.Object {
     JsName(opts) {
       let name = opts && 'name' in opts ? opts.name : null;
-      this.name = name;
+      dart.initField(JsName, this, 'name', name);
     }
   }
   class Overload extends core.Object {
@@ -19,14 +19,14 @@ var dom;
   class RenderingContext extends core.Object {}
   class CanvasDrawingStyles extends core.Object {
     CanvasDrawingStyles() {
-      this.lineWidth = null;
-      this.lineCap = null;
-      this.lineJoin = null;
-      this.miterLimit = null;
-      this.lineDashOffset = null;
-      this.font = null;
-      this.textAlign = null;
-      this.textBaseline = null;
+      dart.initField(CanvasDrawingStyles, this, 'lineWidth', null);
+      dart.initField(CanvasDrawingStyles, this, 'lineCap', null);
+      dart.initField(CanvasDrawingStyles, this, 'lineJoin', null);
+      dart.initField(CanvasDrawingStyles, this, 'miterLimit', null);
+      dart.initField(CanvasDrawingStyles, this, 'lineDashOffset', null);
+      dart.initField(CanvasDrawingStyles, this, 'font', null);
+      dart.initField(CanvasDrawingStyles, this, 'textAlign', null);
+      dart.initField(CanvasDrawingStyles, this, 'textBaseline', null);
     }
   }
   class CanvasPathMethods extends core.Object {}