Remove references to ObjectNotClosureException and ClosureArgumentMismatchException

runtime/lib/errors_patch.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 patch class NoSuchMethodError {
   /* patch */ static String _objectToString(Object object) {
     return Object._toString(object);
   }
 }
 
-// Exceptions that should be NoSuchMethodError instead.
-
-class _ClosureArgumentMismatchException implements Exception {
-  const _ClosureArgumentMismatchException();
-  String toString() => "Closure argument mismatch";
-}
-
-
-class _ObjectNotClosureException implements Exception {
-  const _ObjectNotClosureException();
-  String toString() => "Object is not closure";
-}