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

lib/runtime/dart/_classes.js

Index: lib/runtime/dart/_classes.js
diff --git a/lib/runtime/dart/_classes.js b/lib/runtime/dart/_classes.js
index 5c2171e20aacb386299b0b2ddbd013dea44609fa..36590277167f0688edaf12a95e590f5ccd14dbd8 100644
--- a/lib/runtime/dart/_classes.js
+++ b/lib/runtime/dart/_classes.js
@@ -12,14 +12,15 @@
 // TODO(leafp): Consider splitting some of this out.
 dart_library.library('dart/_classes', null, /* Imports */[
 ], /* Lazy Imports */[
+  'dart/_utils',
   'dart/core',
   'dart/_interceptors',
   'dart/_types',
   'dart/_rtti',
-], function(exports, core, _interceptors, types, rtti) {
+], function(exports, dart_utils, core, _interceptors, types, rtti) {
   'use strict';
 
-  const assert = dart_utils.assert;
+  const assert = dart_utils.assert_;
   const copyProperties = dart_utils.copyProperties;
   const copyTheseProperties = dart_utils.copyTheseProperties;
   const defineMemoizedGetter = dart_utils.defineMemoizedGetter;