Convert dart_utils.js to input_sdk/lib/_internal/utils.dart (#310)

test/codegen/expect/collection/wrappers.js

Index: test/codegen/expect/collection/wrappers.js
diff --git a/test/codegen/expect/collection/wrappers.js b/test/codegen/expect/collection/wrappers.js
index d709bc10bbc6570f71a72e9c3311d0b8068d56b9..439fedfffc42dddcb244491e6aa175aeff5f59a1 100644
--- a/test/codegen/expect/collection/wrappers.js
+++ b/test/codegen/expect/collection/wrappers.js
@@ -9,8 +9,8 @@ dart_library.library('collection/wrappers', null, /* Imports */[
 ], function(exports, dart, canonicalized_map, core, math, collection, unmodifiable_wrappers) {
   'use strict';
   let dartx = dart.dartx;
-  dart.export(exports, canonicalized_map);
-  dart.export(exports, unmodifiable_wrappers);
+  dart.export_(exports, canonicalized_map);
+  dart.export_(exports, unmodifiable_wrappers);
   let _base = Symbol('_base');
   let _DelegatingIterableBase$ = dart.generic(function(E) {
     class _DelegatingIterableBase extends core.Object {
@@ -700,7 +700,7 @@ dart_library.library('collection/wrappers', null, /* Imports */[
         this[_baseMap].putIfAbsent(key, dart.as(dart.fn(() => {
           result = true;
           return value;
-        }), __CastType0));
+        }), __CastType0$(V)));
         return result;
       }
       addAll(elements) {