Use generic functions in zones.

tools/dom/src/shared_html.dart

Index: tools/dom/src/shared_html.dart
diff --git a/tools/dom/src/shared_html.dart b/tools/dom/src/shared_html.dart
index 1120a6e5a3f9b7dc0f3440596c6bb9c3db7d6c62..edeaaed86b265303a6e3e064b67df6910c9cf5fc 100644
--- a/tools/dom/src/shared_html.dart
+++ b/tools/dom/src/shared_html.dart
@@ -4,24 +4,18 @@
 
 part of dart.dom.html;
 
-// TODO(jacobr): remove these typedefs when dart:async supports generic types.
-typedef R _wrapZoneCallback<A, R>(A a);
-typedef R _wrapZoneBinaryCallback<A, B, R>(A a, B b);
-
-_wrapZoneCallback/*<A, R>*/ _wrapZone/*<A, R>*/(
-    _wrapZoneCallback/*<A, R>*/ callback) {
+void Function(T) _wrapZone<T>(void Function(T) callback) {
   // For performance reasons avoid wrapping if we are in the root zone.
   if (Zone.current == Zone.ROOT) return callback;
   if (callback == null) return null;
-  return Zone.current.bindUnaryCallback/*<R, A>*/(callback, runGuarded: true);
+  return Zone.current.bindUnaryCallbackGuarded(callback);
 }
 
-_wrapZoneBinaryCallback/*<A, B, R>*/ _wrapBinaryZone/*<A, B, R>*/(
-    _wrapZoneBinaryCallback/*<A, B, R>*/ callback) {
+void Function(T1, T2) _wrapBinaryZone<T1, T2>(void Function(T1, T2) callback) {
+  // For performance reasons avoid wrapping if we are in the root zone.
   if (Zone.current == Zone.ROOT) return callback;
   if (callback == null) return null;
-  return Zone.current
-      .bindBinaryCallback/*<R, A, B>*/(callback, runGuarded: true);
+  return Zone.current.bindBinaryCallbackGuarded(callback);
 }
 
 /**