Revert two Kernel changes that were causing test failures.

tests/language/async_return_types_test.dart

Index: tests/language/async_return_types_test.dart
diff --git a/tests/language_2/async_return_types_test.dart b/tests/language/async_return_types_test.dart
similarity index 80%
copy from tests/language_2/async_return_types_test.dart
copy to tests/language/async_return_types_test.dart
index eae381b19112164da26fa11a218a0a362ba77ead..5e1c223fc0f3a47373f842963106edccd4d89424 100644
--- a/tests/language_2/async_return_types_test.dart
+++ b/tests/language/async_return_types_test.dart
@@ -14,17 +14,18 @@ Future<int> foo2() async {
   return 3;
 }
 
-Future<int> //# wrongTypeParameter: compile-time error
+Future<int> //# wrongTypeParameter: static type warning, dynamic type error
 foo3() async {
   return "String";
 }
 
-Future<int, String> //# tooManyTypeParameters: compile-time error
+// Future<int, String> is treated like Future<dynamic>
+Future<int, String> //# tooManyTypeParameters: static type warning
 foo4() async {
   return "String";
 }
 
-int //# wrongReturnType: compile-time error
+int //# wrongReturnType: static type warning, dynamic type error
 foo5() async {
   return 3;
 }
@@ -34,7 +35,7 @@ Future<int> foo6() async {
   return new Future<int>.value(3);
 }
 
-Future<Future<int>> //# nestedFuture: compile-time error
+Future<Future<int>> //# nestedFuture: static type warning, dynamic type error
 foo7() async {
   return new Future<int>.value(3);
 }