fix #43, remove => workaround

lib/runtime/dart/_debugger.js

 dart_library.library('dart/_debugger', null, /* Imports */[
   'dart/_runtime',
   'dart/core'
 ], /* Lazy imports */[
 ], function(exports, dart, core) {
   'use strict';
   let dartx = dart.dartx;
   const skipDartConfig = dart.const(new core.Object());
   exports.maxIterableChildrenToDisplay = 50;
   dart.defineLazyProperties(exports, {
@@ skipping 138 matching lines @@
     createChild(tagName) {
       let c = new JsonMLElement(tagName);
       this[_jsonML][dartx.add](c.toJsonML());
       return c;
     }
     createObjectTag(object) {
       return (() => {
         let _ = this.createChild('object');
         _.addAttribute('object', object);
         return _;
-      }).bind(this)();
+      })();
     }
     setStyle(style) {
       dart.dput(this[_attributes], 'style', style);
     }
     addStyle(style) {
       if (dart.dload(this[_attributes], 'style') == null) {
         dart.dput(this[_attributes], 'style', style);
       } else {
         let o = this[_attributes];
         dart.dput(o, 'style', dart.dsend(dart.dload(o, 'style'), '+', style));
@@ skipping 386 matching lines @@
   exports.DartFormatter = DartFormatter;
   exports.ObjectFormatter = ObjectFormatter;
   exports.FunctionFormatter = FunctionFormatter;
   exports.MapFormatter = MapFormatter;
   exports.IterableFormatter = IterableFormatter;
   exports.ClassMetadataFormatter = ClassMetadataFormatter;
   exports.MapEntryFormatter = MapEntryFormatter;
   exports.HeritageClauseFormatter = HeritageClauseFormatter;
   exports.registerDevtoolsFormatter = registerDevtoolsFormatter;
 });