remove pkg/mock

pkg/mock/lib/src/util.dart

-// Copyright (c) 2014, 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 mock.util;
-
-import 'package:matcher/matcher.dart';
-
-/** Utility function for optionally qualified method names */
-String qualifiedName(owner, String method) {
-  if (owner == null || identical(owner, anything)) {
-    return method;
-  } else if (owner is Matcher) {
-    Description d = new StringDescription();
-    d.addDescriptionOf(owner);
-    d.add('.');
-    d.add(method);
-    return d.toString();
-  } else {
-    return '$owner.$method';
-  }
-}
-
-/** Sentinel value for representing no argument. */
-class _Sentinel {
-  const _Sentinel();
-}
-const NO_ARG = const _Sentinel();