js: fix core.Object, output order, static const fields

test/codegen/expect/sunflower.js

Index: test/codegen/expect/sunflower.js
diff --git a/test/codegen/expect/sunflower.js b/test/codegen/expect/sunflower.js
index a3f34e0bd2deb205c2d577b993f90719e4c06dfb..5f680329a8c9f091cc825096fd494ac9288286a0 100644
--- a/test/codegen/expect/sunflower.js
+++ b/test/codegen/expect/sunflower.js
@@ -27,14 +27,14 @@ var sunflower;
       return dart.as(dart.as(querySelector("#canvas"), dom.CanvasElement).getContext('2d'), dom.CanvasRenderingContext2D);
     }
   });
-  class Circle extends dart.Object {
+  class Circle extends core.Object {
     Circle(x, y, radius) {
       this.x = x;
       this.y = y;
       this.radius = radius;
     }
   }
-  class CirclePainter extends dart.Object {
+  class CirclePainter extends core.Object {
     CirclePainter() {
       this.color = ORANGE;
     }