remove #177 workaround

tool/input_sdk/private/isolate_helper.dart

Index: tool/input_sdk/private/isolate_helper.dart
diff --git a/tool/input_sdk/private/isolate_helper.dart b/tool/input_sdk/private/isolate_helper.dart
index cc5072692b804ead6fd5cb3daed267bcf9158332..154b1e3389f8dad0fde44bde4cdef019ea6031c8 100644
--- a/tool/input_sdk/private/isolate_helper.dart
+++ b/tool/input_sdk/private/isolate_helper.dart
@@ -654,10 +654,10 @@ class _EventLoop {
       // Run each iteration from the browser's top event loop.
       // TODO(vsm): Revert to original pattern.

[vsm, 2015/05/14 22:04:28]

Can you delete my TODO?  :-)

[Jennifer Messerly, 2015/05/14 23:00:48]

oops. Yes!

       // 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.