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

test/codegen/expect/unittest.js

Index: test/codegen/expect/unittest.js
diff --git a/test/codegen/expect/unittest.js b/test/codegen/expect/unittest.js
index 8a6fff1c9bc453800a08552e27af57a91bee9e0c..2018b5bad47b455c8c341a3c080afd7d498666b3 100644
--- a/test/codegen/expect/unittest.js
+++ b/test/codegen/expect/unittest.js
@@ -11,7 +11,7 @@ dart_library.library('unittest', null, /* Imports */[
 ], function(exports, dart, matcher, dom, core, async, interfaces, util, description$) {
   'use strict';
   let dartx = dart.dartx;
-  dart.export(exports, matcher);
+  dart.export_(exports, matcher);
   function group(name, body) {
     return dart.dsend(dom.window, 'suite', name, body);
   }