fix #29753, use ES5 constructors for ddc

pkg/dev_compiler/test/codegen_expected/sunflower/sunflower.js

 define(['dart_sdk'], function(dart_sdk) {
   'use strict';
   const core = dart_sdk.core;
   const html = dart_sdk.html;
   const math = dart_sdk.math;
   const dart = dart_sdk.dart;
   const dartx = dart_sdk.dartx;
   const sunflower = Object.create(null);
   const circle = Object.create(null);
   const painter = Object.create(null);
@@ skipping 48 matching lines @@
   };
   dart.fn(sunflower.main, VoidTovoid());
   sunflower.draw = function() {
     sunflower.seeds = core.int.parse(sunflower.slider.value);
     sunflower.context.clearRect(0, 0, sunflower.MAX_D, sunflower.MAX_D);
     for (let i = 0; i < dart.notNull(sunflower.seeds); i++) {
       let theta = i * painter.TAU / dart.notNull(sunflower.PHI);
       let r = dart.notNull(math.sqrt(i)) * sunflower.SCALE_FACTOR;
       let x = sunflower.centerX + r * dart.notNull(math.cos(theta));
       let y = sunflower.centerY - r * dart.notNull(math.sin(theta));
-      new sunflower.SunflowerSeed(x, y, sunflower.SEED_RADIUS).draw(sunflower.context);
+      new sunflower.SunflowerSeed.new(x, y, sunflower.SEED_RADIUS).draw(sunflower.context);
     }
     sunflower.notes[dartx.text] = dart.str`${sunflower.seeds} seeds`;
   };
   dart.fn(sunflower.draw, VoidTovoid());
   circle.Circle = class Circle extends core.Object {
     get x() {
       return this[x$];
     }
     set x(value) {
       super.x = value;
     }
     get y() {
       return this[y$];
     }
     set y(value) {
       super.y = value;
     }
     get radius() {
       return this[radius$];
     }
     set radius(value) {
       super.radius = value;
     }
-    new(x, y, radius) {
-      this[x$] = x;
-      this[y$] = y;
-      this[radius$] = radius;
-    }
   };
+  (circle.Circle.new = function(x, y, radius) {
+    this[x$] = x;
+    this[y$] = y;
+    this[radius$] = radius;
+  }).prototype = circle.Circle.prototype;
   const x$ = Symbol("Circle.x");
   const y$ = Symbol("Circle.y");
   const radius$ = Symbol("Circle.radius");
   dart.setSignature(circle.Circle, {
     fields: () => ({
       x: dart.finalFieldType(core.num),
       y: dart.finalFieldType(core.num),
       radius: dart.finalFieldType(core.num)
     })
   });
   painter.CirclePainter = class CirclePainter extends core.Object {
-    new() {
-      this[color] = painter.ORANGE;
-    }
     get color() {
       return this[color];
     }
     set color(value) {
       this[color] = value;
     }
     draw(context) {
       context.beginPath();
       context.lineWidth = 2;
       context.fillStyle = this.color;
       context.strokeStyle = this.color;
       context[dartx.arc](this.x, this.y, this.radius, 0, painter.TAU, false);
       context[dartx.fill]();
       context.closePath();
       context.stroke();
     }
   };
+  (painter.CirclePainter.new = function() {
+    this[color] = painter.ORANGE;
+  }).prototype = painter.CirclePainter.prototype;
   const color = Symbol("CirclePainter.color");
   painter.CirclePainter[dart.implements] = () => [circle.Circle];
   dart.setSignature(painter.CirclePainter, {
     fields: () => ({color: dart.fieldType(core.String)}),
     methods: () => ({draw: dart.fnType(dart.void, [html.CanvasRenderingContext2D])})
   });
-  sunflower.SunflowerSeed = class SunflowerSeed extends dart.mixin(circle.Circle, painter.CirclePainter) {
-    new(x, y, radius, color) {
-      if (color === void 0) color = null;
-      super.new(x, y, radius);
-      if (color != null) this.color = color;
-    }
-  };
+  sunflower.SunflowerSeed = class SunflowerSeed extends dart.mixin(circle.Circle, painter.CirclePainter) {};
+  (sunflower.SunflowerSeed.new = function(x, y, radius, color) {
+    if (color === void 0) color = null;
+    sunflower.SunflowerSeed.__proto__.new.call(this, x, y, radius);
+    if (color != null) this.color = color;
+  }).prototype = sunflower.SunflowerSeed.prototype;
   dart.defineLazy(painter, {
     get ORANGE() {
       return "orange";
     },
     get RED() {
       return "red";
     },
     get BLUE() {
       return "blue";
     },
@@ skipping 20 matching lines @@
   }, null);
   // Exports:
   return {
     sunflower: sunflower,
     circle: circle,
     painter: painter
   };
 });
 
 //# sourceMappingURL=sunflower.js.map