fixes #193, factory constructors as static methods

lib/runtime/dart/_js_names.js

 var _js_names = dart.defineLibrary(_js_names, {});
 var _foreign_helper = dart.lazyImport(_foreign_helper);
 var _js_embedded_names = dart.import(_js_embedded_names);
 var core = dart.import(core);
 var _interceptors = dart.import(_interceptors);
 var _js_helper = dart.lazyImport(_js_helper);
 (function(exports, _foreign_helper, _js_embedded_names, core, _interceptors, _js_helper) {
   'use strict';
   function preserveNames() {
   }
@@ skipping 42 matching lines @@
   dart.fn(computeReflectiveNames, core.Map$(core.String, core.String), [core.Map$(core.String, core.String)]);
   function extractKeys(victim) {
     let result = function(victim, hasOwnProperty) {
       var result = [];
       for (var key in victim) {
         if (hasOwnProperty.call(victim, key))
           result.push(key);
       }
       return result;
     }(victim, Object.prototype.hasOwnProperty);
-    return new _interceptors.JSArray.markFixed(result);
+    return _interceptors.JSArray.markFixed(result);
   }
   dart.fn(extractKeys, core.List, [core.Object]);
   function unmangleGlobalNameIfPreservedAnyways(name) {
     let names = _foreign_helper.JS_EMBEDDED_GLOBAL('=Object', _js_embedded_names.MANGLED_GLOBAL_NAMES);
     return dart.as(_js_helper.JsCache.fetch(names, name), core.String);
   }
   dart.fn(unmangleGlobalNameIfPreservedAnyways, core.String, [core.String]);
   function unmangleAllIdentifiersIfPreservedAnyways(str) {
     return str.replace(/[^<,> ]+/g, function(m) {
       return _foreign_helper.JS_EMBEDDED_GLOBAL('', _js_embedded_names.MANGLED_GLOBAL_NAMES)[m] || m;
     });
   }
   dart.fn(unmangleAllIdentifiersIfPreservedAnyways, core.String, [core.String]);
   // Exports:
   exports.preserveNames = preserveNames;
   exports.computeMangledNames = computeMangledNames;
   exports.computeReflectiveNames = computeReflectiveNames;
   exports.extractKeys = extractKeys;
   exports.unmangleGlobalNameIfPreservedAnyways = unmangleGlobalNameIfPreservedAnyways;
   exports.unmangleAllIdentifiersIfPreservedAnyways = unmangleAllIdentifiersIfPreservedAnyways;
 })(_js_names, _foreign_helper, _js_embedded_names, core, _interceptors, _js_helper);