feat: remove MapWrapper.contains().

modules/angular2/src/router/route_recognizer.ts

@@ -90,7 +90,7 @@ export class RouteRecognizer {
     return solutions;
   }
 
-  hasRoute(name: string): boolean { return MapWrapper.contains(this.names, name); }
+  hasRoute(name: string): boolean { return this.names.has(name); }
 
   generate(name: string, params: any): string {
     var pathRecognizer = this.names.get(name);

modules/angular2/src/router/route_registry.ts

@@ -69,7 +69,7 @@ export class RouteRegistry {
 
     // Don't read the annotations from a type more than once –
     // this prevents an infinite loop if a component routes recursively.
-    if (MapWrapper.contains(this._rules, component)) {
+    if (this._rules.has(component)) {
       return;
     }
     var annotations = reflector.annotations(component);