fixes #43, remove => workaround

lib/runtime/dart/_js_helper.js

 var _js_helper = dart.defineLibrary(_js_helper, {});
 var core = dart.import(core);
 var collection = dart.import(collection);
 var _internal = dart.import(_internal);
 var _foreign_helper = dart.import(_foreign_helper);
 var _js_embedded_names = dart.import(_js_embedded_names);
 var _interceptors = dart.lazyImport(_interceptors);
 var _js_names = dart.import(_js_names);
 var async = dart.import(async);
 var _isolate_helper = dart.lazyImport(_isolate_helper);
@@ skipping 124 matching lines @@
         let keys = this[_keys];
         for (let i = 0; dart.notNull(i) < dart.notNull(dart.as(dart.dload(keys, 'length'), core.num)); i = dart.notNull(i) + 1) {
           let key = dart.dindex(keys, i);
           f(dart.as(key, K), dart.as(this[_fetch](key), V));
         }
       }
       get keys() {
         return new (_ConstantMapKeyIterable$(K))(this);
       }
       get values() {
-        return _internal.MappedIterable$(K, V).new(this[_keys], dart.fn((key => dart.as(this[_fetch](key), V)).bind(this), V, [core.Object]));
+        return _internal.MappedIterable$(K, V).new(this[_keys], dart.fn(key => dart.as(this[_fetch](key), V), V, [core.Object]));
       }
     }
     ConstantStringMap[dart.implements] = () => [_internal.EfficientLength];
     dart.defineNamedConstructor(ConstantStringMap, '_');
     dart.setSignature(ConstantStringMap, {
       constructors: () => ({_: [ConstantStringMap$(K, V), [core.int, core.Object, core.List$(K)]]}),
       methods: () => ({
         containsValue: [core.bool, [core.Object]],
         containsKey: [core.bool, [core.Object]],
         get: [V, [core.Object]],
@@ skipping 1662 matching lines @@
         let positions = dart.map();
         for (let i = 0; dart.notNull(i) < dart.notNull(this.optionalParameterCount); i = dart.notNull(i) + 1) {
           let index = dart.notNull(this.requiredParameterCount) + dart.notNull(i);
           positions.set(this.parameterName(index), index);
         }
         let index = 0;
         (() => {
           let _ = positions.keys[core.$toList]();
           _[core.$sort]();
           return _;
-        })()[core.$forEach](dart.fn((name => {
+        })()[core.$forEach](dart.fn(name => {
           this.cachedSortedIndices[core.$set]((() => {
             let x = index;
             index = dart.notNull(x) + 1;
             return x;
           })(), positions.get(name));
-        }).bind(this), core.Object, [core.String]));
+        }, core.Object, [core.String]));
       }
       return dart.as(this.cachedSortedIndices[core.$get](unsortedIndex), core.int);
     }
     computeFunctionRti(jsConstructor) {
       if (typeof this.functionType == "number") {
         return getMetadata(dart.as(this.functionType, core.int));
       } else if (typeof this.functionType == "function") {
         let fakeInstance = new jsConstructor();
         setRuntimeTypeInfo(fakeInstance, fakeInstance["<>"]);
         return this.functionType.apply({$receiver: fakeInstance});
@@ skipping 2535 matching lines @@
   exports.jsonEncodeNative = jsonEncodeNative;
   exports.getIsolateAffinityTag = getIsolateAffinityTag;
   exports.LoadLibraryFunctionType = LoadLibraryFunctionType;
   exports.DeferredLoadCallback = DeferredLoadCallback;
   exports.loadDeferredLibrary = loadDeferredLibrary;
   exports.MainError = MainError;
   exports.missingMain = missingMain;
   exports.badMain = badMain;
   exports.mainHasTooManyParameters = mainHasTooManyParameters;
 })(_js_helper, core, collection, _internal, _foreign_helper, _js_embedded_names, _interceptors, _js_names, async, _isolate_helper);