bind to localhost instead of all interfaces, and fix closureWrap

lib/runtime/dart_runtime.js

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // TODO(jmesserly, sigmund): remove these two lines:
 var math = Math;
 var core = core || {int: { parse: Number }, print: e => console.log(e) };
 
 var dart;
 (function (dart) {
@@ skipping 99 matching lines @@
   function is(obj, type) {
     // TODO(vsm): Implement.
     throw new core.UnimplementedError();
   }
   dart.is = is;
 
   function closureWrap(obj, type) {
     // TODO(vsm): Remove this once we handle in the checker.
     return obj;
   }
+  dart.closureWrap = closureWrap;
 
   function isGroundType(type) {
     // TODO(vsm): Implement.
     throw new core.UnimplementedError();
   }
   dart.isGroundType = isGroundType;
 
   function arity(f) {
     // TODO(vsm): Implement.
     throw new core.UnimplementedError();
@@ skipping 204 matching lines @@
       return value;
     }
     return makeGenericType;
   }
   dart.generic = generic;
 
   // TODO(jmesserly): this is just a placeholder.
   dart.dynamic = Object.create(null);
 
 })(dart || (dart = {}));