remove #177 workaround

tool/input_sdk/private/isolate_helper.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library _isolate_helper;
 
 import 'dart:_js_embedded_names' show
     CLASS_ID_EXTRACTOR,
     CLASS_FIELDS_EXTRACTOR,
     CURRENT_SCRIPT,
@@ skipping 634 matching lines @@
     return true;
   }
 
   /**
    * Runs multiple iterations of the run-loop. If possible, each iteration is
    * run asynchronously.
    */
   void _runHelper() {
     if (globalWindow != null) {
       // Run each iteration from the browser's top event loop.
-      // TODO(vsm): Revert to original pattern.
-      // See: https://github.com/dart-lang/dev_compiler/issues/177
-      Function next = () {
+      next() {
         if (!runIteration()) return;
         Timer.run(next);
-      };
+      }
       next();
     } else {
       // Run synchronously until no more iterations are available.
       while (runIteration()) {}
     }
   }
 
   /**
    * Call [_runHelper] but ensure that worker exceptions are propragated.
    */
@@ skipping 782 matching lines @@
   }
 
   bool operator==(Object other) {
     if (identical(other, this)) return true;
     if (other is CapabilityImpl) {
       return identical(_id, other._id);
     }
     return false;
   }
 }