Fix tests

lib/runtime/dart/js.js

 dart_library.library('dart/js', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
   'dart/collection',
   'dart/_js_helper'
 ], /* Lazy imports */[
 ], function(exports, dart, core, collection, _js_helper) {
   'use strict';
   let dartx = dart.dartx;
   const _global = dart.global;
@@ skipping 156 matching lines @@
   const _checkIndex = Symbol('_checkIndex');
   const _checkInsertIndex = Symbol('_checkInsertIndex');
   const JsArray$ = dart.generic(function(E) {
     class JsArray extends dart.mixin(JsObject, collection.ListMixin$(E)) {
       JsArray() {
         super._fromJs([]);
       }
       from(other) {
         super._fromJs((() => {
           let _ = [];
-          _[dartx.addAll](other[dartx.map](dart.as(_convertToJS, __CastType0)));
+          _[dartx.addAll](other[dartx.map](_convertToJS));
           return _;
         })());
       }
       _fromJs(jsObject) {
         super._fromJs(jsObject);
       }
       [_checkIndex](index) {
         if (typeof index == 'number' && (dart.notNull(index) < 0 || dart.notNull(index) >= dart.notNull(this.length))) {
           dart.throw(new core.RangeError.range(index, 0, this.length));
         }
@@ skipping 207 matching lines @@
         for (let arg of arguments) {
           args.push(arg);
         }
         return f(...args);
       }, core.Function);
       exports._interopCaptureThisExpando.set(f, ret);
     }
     return ret;
   }
   dart.fn(allowInteropCaptureThis, core.Function, [core.Function]);
-  const __CastType0$ = dart.generic(function(E) {
-    const __CastType0 = dart.typedef('__CastType0', () => dart.functionType(dart.dynamic, [E]));
-    return __CastType0;
-  });
-  let __CastType0 = __CastType0$();
   // Exports:
   exports.JsObject = JsObject;
   exports.JsFunction = JsFunction;
   exports.JsArray$ = JsArray$;
   exports.JsArray = JsArray;
   exports.allowInterop = allowInterop;
   exports.allowInteropCaptureThis = allowInteropCaptureThis;
 });