Revert "Fix VM not accepting static methods for Isolate.spawn."

tests/isolate/static_function_lib.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.
-
-library static_function_testlib;
-import "dart:isolate" show SendPort;
-
-// Used by static_function_test.dart.
-
-void function(port) { port.send("LIBTOP"); }
-void _function(port) { port.send("_LIBTOP"); }
-
-Function get privateFunction => _function;
-
-class C {
-  static void function(SendPort port) { port.send("LIB"); }
-  static void _function(SendPort port) { port.send("LIBPRIVATE"); }
-  static Function get privateFunction => _function;
-}
-
-Function get privateClassFunction => _C.function;
-Function get privateClassAndFunction => _C._function;
-
-class _C {
-  static void function(SendPort port) { port.send("_LIB"); }
-  static void _function(SendPort port) { port.send("_LIBPRIVATE"); }
-}