fix: minor fixes

Author: vicb

dist/zone-microtask.js

@@ -1703,19 +1703,21 @@ function apply() {
   if (!('registerElement' in global.document)) {
     return;
   }
+
   var _registerElement = document.registerElement;
   var callbacks = [
     'createdCallback',
     'attachedCallback',
     'detachedCallback',
     'attributeChangedCallback'
   ];
+
   document.registerElement = function (name, opts) {
     callbacks.forEach(function (callback) {
       if (opts.prototype[callback]) {
         var descriptor = Object.getOwnPropertyDescriptor(opts.prototype, callback);
         if (descriptor.value) {
-          descriptor.value = zone.bind(descriptor.value || opts.prototype[callback]);
+          descriptor.value = global.zone.bind(descriptor.value || opts.prototype[callback]);
           _redefineProperty(opts.prototype, callback, descriptor);
         }
       }