feat: remove MapWrapper.create()/get()/set().

Better dart2js code, better Angular code.

modules/benchmarks/src/compiler/compiler_benchmark.ts

@@ -101,7 +101,7 @@ class MultipleTemplateResolver extends TemplateResolver {
   constructor(multiple: number, components: List<Type>) {
     super();
     this._multiple = multiple;
-    this._cache = MapWrapper.create();
+    this._cache = new Map();
     ListWrapper.forEach(components, (c) => this._warmUp(c));
   }
 
@@ -111,13 +111,13 @@ class MultipleTemplateResolver extends TemplateResolver {
     for (var i = 0; i < this._multiple; ++i) {
       multiplier[i] = view.template;
     }
-    MapWrapper.set(this._cache, component, ListWrapper.join(multiplier, ''));
+    this._cache.set(component, ListWrapper.join(multiplier, ''));
   }
 
   resolve(component: Type): viewModule.View {
     var view = super.resolve(component);
     var myView = new viewModule.View(
-        {template:<string>MapWrapper.get(this._cache, component), directives: view.directives});
+        {template:<string>this._cache.get(component), directives: view.directives});
     return myView;
   }
 }

modules/benchmarks/src/naive_infinite_scroll/cells.ts

@@ -7,9 +7,9 @@ import {Component, Directive, View} from 'angular2/angular2';
 export class HasStyle {
   style: Map<any, any>;
 
-  constructor() { this.style = MapWrapper.create(); }
+  constructor() { this.style = new Map(); }
 
-  set width(w) { MapWrapper.set(this.style, 'width', w); }
+  set width(w) { this.style.set('width', w); }
 }
 
 @Component({selector: 'company-name', properties: ['width: cell-width', 'company']})
@@ -33,7 +33,7 @@ export class OfferingNameComponent extends HasStyle {
 export class Stage {
   name: string;
   isDisabled: boolean;
-  style: Map;
+  style: Map<string, string>;
   apply: Function;
 }
 
@@ -73,9 +73,8 @@ export class StageButtonsComponent extends HasStyle {
       var stage = new Stage();
       stage.name = status;
       stage.isDisabled = disabled;
-      var stageStyle = MapWrapper.create();
-      MapWrapper.set(stageStyle, 'background-color',
-                     disabled ? '#DDD' : isCurrent ? '#DDF' : '#FDD');
+      var stageStyle = new Map<string, string>();
+      stageStyle.set('background-color', disabled ? '#DDD' : isCurrent ? '#DDF' : '#FDD');
       stage.style = stageStyle;
       if (isCurrent) {
         disabled = false;

modules/benchmarks/src/naive_infinite_scroll/common.ts

@@ -57,7 +57,7 @@ export class CustomDate {
 export class RawEntity {
   _data: Map<any, any>;
 
-  constructor() { this._data = MapWrapper.create(); }
+  constructor() { this._data = new Map(); }
 
   get(key: string) {
     if (key.indexOf('.') == -1) {