Disallow explicit parameter default values in redirecting factory (issue 13662).

sdk/lib/async/zone.dart

Index: sdk/lib/async/zone.dart
===================================================================
--- sdk/lib/async/zone.dart	(revision 29294)
+++ sdk/lib/async/zone.dart	(working copy)
@@ -64,29 +64,29 @@
    */
   const factory ZoneSpecification({
     dynamic handleUncaughtError(Zone self, ZoneDelegate parent, Zone zone,
-                                error, StackTrace stackTrace): null,
-    dynamic run(Zone self, ZoneDelegate parent, Zone zone, f()): null,
+                                error, StackTrace stackTrace),
+    dynamic run(Zone self, ZoneDelegate parent, Zone zone, f()),
     dynamic runUnary(
-        Zone self, ZoneDelegate parent, Zone zone, f(arg), arg): null,
+        Zone self, ZoneDelegate parent, Zone zone, f(arg), arg),
     dynamic runBinary(Zone self, ZoneDelegate parent, Zone zone,
-                      f(arg1, arg2), arg1, arg2): null,
+                      f(arg1, arg2), arg1, arg2),
     ZoneCallback registerCallback(
-        Zone self, ZoneDelegate parent, Zone zone, f()): null,
+        Zone self, ZoneDelegate parent, Zone zone, f()),
     ZoneUnaryCallback registerUnaryCallback(
-        Zone self, ZoneDelegate parent, Zone zone, f(arg)): null,
+        Zone self, ZoneDelegate parent, Zone zone, f(arg)),
     ZoneBinaryCallback registerBinaryCallback(
-        Zone self, ZoneDelegate parent, Zone zone, f(arg1, arg2)): null,
+        Zone self, ZoneDelegate parent, Zone zone, f(arg1, arg2)),
     void scheduleMicrotask(
-        Zone self, ZoneDelegate parent, Zone zone, f()): null,
+        Zone self, ZoneDelegate parent, Zone zone, f()),
     void runAsync(
-        Zone self, ZoneDelegate parent, Zone zone, f()): null,
+        Zone self, ZoneDelegate parent, Zone zone, f()),
     Timer createTimer(Zone self, ZoneDelegate parent, Zone zone,
-                      Duration duration, void f()): null,
+                      Duration duration, void f()),
     Timer createPeriodicTimer(Zone self, ZoneDelegate parent, Zone zone,
-                              Duration period, void f(Timer timer)): null,
-    void print(Zone self, ZoneDelegate parent, Zone zone, String line): null,
+                              Duration period, void f(Timer timer)),
+    void print(Zone self, ZoneDelegate parent, Zone zone, String line),
     Zone fork(Zone self, ZoneDelegate parent, Zone zone,
-              ZoneSpecification specification, Map zoneValues): null
+              ZoneSpecification specification, Map zoneValues)
   }) = _ZoneSpecification;
 
   /**