dart-lang#1363. Excessive delays removed

Author: sgrekhov

Language/Statements/For/Asynchronous_For_in/enclosing_loop_t01.dart

@@ -45,7 +45,7 @@ Future test2() async {
       } else if (!streamController.isClosed) {
         streamController.close();
       }
-      await new Future.delayed(new Duration(microseconds: 100));
+      await null;
     }
   }
   Expect.listEquals(['a', 'a1', 'a2', '1', '11', '12', '2', '21', '22'], log);

Language/Statements/For/Asynchronous_For_in/execution_A05_t05.dart

@@ -59,8 +59,9 @@ main() async {
   StreamController sc = StreamController();
   sc.addStream(Stream.fromIterable([1, 2, 3])).then((_) async {
     Expect.listEquals([1, 2, 3], log);
-    await Future.delayed(Duration(milliseconds: 100));
+    await null;
     sc.add(42); // await for is suspended now
+    Expect.listEquals([1, 2, 3], log);
     await Future.delayed(Duration(milliseconds: 100));
     Expect.listEquals([1, 2, 3, 42], log);
     visited = true;