Revert "Fix scoping async functions."

tests/language/await_future_test.dart

Index: tests/language/await_future_test.dart
diff --git a/tests/language/await_future_test.dart b/tests/language/await_future_test.dart
index ff1ab7a902af082ec4b070d3e7e21c0eec7cba56..9811f37f171181069532add2933a3c9748fa6ce6 100644
--- a/tests/language/await_future_test.dart
+++ b/tests/language/await_future_test.dart
@@ -48,28 +48,6 @@ quazz() async {
   }
 }
 
-nesting() async {
-  try {
-    try {
-      var x = 1;
-      var y = () async {
-        try {
-          var z = (await bar(3)) + x;
-          throw z;
-        }  catch (e1) {
-          return e1;
-        }
-      };
-      var a = await y();
-      throw a;
-    } catch (e2) {
-      throw e2 + 1;
-    }
-  } catch (e3) {
-    return e3;
-  }
-}
-
 main() async {
   var result;
   for (int i = 0; i < 10; i++) {
@@ -79,7 +57,5 @@ main() async {
     Expect.equals(result, 17);
     result = await quazz();
     Expect.equals(result, 2);
-    result = await nesting();
-    Expect.equals(result, 5);
   }
 }