fixes #131, use before define from variables to classes

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 3705 matching lines @@
   }
   // Function jsonEncodeNative: (String) → String
   function jsonEncodeNative(string) {
     return JSON.stringify(string);
   }
   // Function getIsolateAffinityTag: (String) → String
   function getIsolateAffinityTag(name) {
     let isolateTagGetter = _foreign_helper.JS_EMBEDDED_GLOBAL('', _js_embedded_names.GET_ISOLATE_TAG);
     return isolateTagGetter(name);
   }
-  let LoadLibraryFunctionType = dart.typedef('LoadLibraryFunctionType', () => dart.functionType(async.Future$(core.Null), []));
+  let LoadLibraryFunctionType = dart.typedef('LoadLibraryFunctionType', dart.functionType(async.Future$(core.Null), []));
   // Function _loadLibraryWrapper: (String) → () → Future<Null>
   function _loadLibraryWrapper(loadId) {
     return () => loadDeferredLibrary(loadId);
   }
   dart.defineLazyProperties(exports, {
     get _loadingLibraries() {
       return dart.map();
     },
     get _loadedLibraries() {
       return new (core.Set$(core.String))();
     }
   });
-  let DeferredLoadCallback = dart.typedef('DeferredLoadCallback', () => dart.functionType(dart.void, []));
+  let DeferredLoadCallback = dart.typedef('DeferredLoadCallback', dart.functionType(dart.void, []));
   exports.deferredLoadHook = null;
   // Function loadDeferredLibrary: (String) → Future<Null>
   function loadDeferredLibrary(loadId) {
     let urisMap = _foreign_helper.JS_EMBEDDED_GLOBAL('', _js_embedded_names.DEFERRED_LIBRARY_URIS);
     let uris = dart.as(urisMap[loadId], core.List$(core.String));
     let hashesMap = _foreign_helper.JS_EMBEDDED_GLOBAL('', _js_embedded_names.DEFERRED_LIBRARY_HASHES);
     let hashes = dart.as(hashesMap[loadId], core.List$(core.String));
     if (uris == null)
       return new (async.Future$(core.Null)).value(null);
     let indices = new (core.List$(core.int)).generate(uris[core.$length], i => dart.as(i, core.int));
@@ skipping 98 matching lines @@
     throw new MainError("No top-level function named 'main'.");
   }
   // Function badMain: () → void
   function badMain() {
     throw new MainError("'main' is not a function.");
   }
   // Function mainHasTooManyParameters: () → void
   function mainHasTooManyParameters() {
     throw new MainError("'main' expects too many parameters.");
   }
-  let __CastType0 = dart.typedef('__CastType0', () => dart.functionType(core.int, [core.String]));
-  let __CastType2 = dart.typedef('__CastType2', () => dart.functionType(core.double, [core.String]));
+  let __CastType0 = dart.typedef('__CastType0', dart.functionType(core.int, [core.String]));
+  let __CastType2 = dart.typedef('__CastType2', dart.functionType(core.double, [core.String]));
   // Exports:
   exports.NoSideEffects = NoSideEffects;
   exports.NoThrows = NoThrows;
   exports.NoInline = NoInline;
   exports.IrRepresentation = IrRepresentation;
   exports.Native = Native;
   exports.ConstantMap$ = ConstantMap$;
   exports.ConstantMap = ConstantMap;
   exports.ConstantStringMap$ = ConstantStringMap$;
   exports.ConstantStringMap = ConstantStringMap;
@@ skipping 213 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);