simplify constructors, fixes #564

test/codegen/expect/closure.js

 export const closure = Object.create(null);
 import { core, js, dart, dartx } from 'dart_sdk';
 closure.generic_function = function(T) {
   return (items: core.List<T>, seed: T): core.List<T> => {
     let strings = items[dartx.map](core.String)(dart.fn((i: T): string => `${i}`, core.String, [T]))[dartx.toList]();
     return items;
   };
 };
 dart.fn(closure.generic_function, T => [core.List$(T), [core.List$(T), T]]);
 closure.Callback = dart.typedef('Callback', () => dart.functionType(dart.void, [], {i: core.int}));
 closure.Foo$ = dart.generic(T => {
   class Foo<T> extends core.Object {
     i: number;
     b: boolean;
     s: string;
     v: T;
     static some_static_constant: string;
     static some_static_final: string;
     static some_static_var: string;
-    Foo(i: number, v: T) {
+    new(i: number, v: T) {
       this.i = i;
       this.v = v;
       this.b = null;
       this.s = null;
     }
     static build() {
       return new (closure.Foo$(T))(1, null);
     }
     untyped_method(a, b) {}
     pass(t: T) {
@@ skipping 14 matching lines @@
       return null;
     }
     set prop(value: string) {}
     static get staticProp() {
       return null;
     }
     static set staticProp(value: string) {}
   }
   dart.setSignature(Foo, {
     constructors: () => ({
-      Foo: [closure.Foo$(T), [core.int, T]],
+      new: [closure.Foo$(T), [core.int, T]],
       build: [closure.Foo$(T), []]
     }),
     methods: () => ({
       untyped_method: [dart.dynamic, [dart.dynamic, dart.dynamic]],
       pass: [T, [T]],
       typed_method: [core.String, [closure.Foo, core.List, core.int, core.num, core.double, core.bool, core.String, js.JsArray, js.JsObject, js.JsFunction]],
       optional_params: [dart.dynamic, [dart.dynamic], [dart.dynamic, core.int]],
       nullary_method: [dart.dynamic, []],
       function_params: [dart.dynamic, [dart.functionType(core.int, [dart.dynamic], [dart.dynamic]), dart.functionType(dart.dynamic, [dart.dynamic], {y: core.String, z: dart.dynamic}), closure.Callback]],
       run: [dart.dynamic, [core.List, core.String, dart.functionType(core.List, [core.String]), dart.functionType(core.List$(core.int), [dart.functionType(dart.dynamic, [dart.dynamic])])], {h: core.Map$(core.Map, core.Map)}]
     }),
     statics: () => ({named_params: [dart.dynamic, [dart.dynamic], {b: dart.dynamic, c: core.int}]}),
     names: ['named_params']
   });
   return Foo;
 });
 closure.Foo = closure.Foo$();
 /** @final {string} */
 closure.Foo.some_static_constant = "abc";
 /** @final {string} */
 closure.Foo.some_static_final = "abc";
 /** @type {string} */
 closure.Foo.some_static_var = "abc";
 closure.Bar = class Bar extends core.Object {};
 closure.Baz = class Baz extends dart.mixin(closure.Foo$(core.int), closure.Bar) {
-  Baz(i: number) {
-    super.Foo(i, 123);
+  new(i: number) {
+    super.new(i, 123);
   }
 };
 dart.setSignature(closure.Baz, {
-  constructors: () => ({Baz: [closure.Baz, [core.int]]})
+  constructors: () => ({new: [closure.Baz, [core.int]]})
 });
 closure.main = function(args): void {
 };
 dart.fn(closure.main, dart.void, [dart.dynamic]);
 /** @final {string} */
 closure.some_top_level_constant = "abc";
 /** @final {string} */
 closure.some_top_level_final = "abc";
 /** @type {string} */
 closure.some_top_level_var = "abc";