remove pkg/mock

pkg/mock/lib/src/action.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.action;
-
-/** The ways in which a call to a mock method can be handled. */
-class Action {
-  /** Do nothing (void method) */
-  static const IGNORE = const Action._('IGNORE');
-
-  /** Return a supplied value. */
-  static const RETURN = const Action._('RETURN');
-
-  /** Throw a supplied value. */
-  static const THROW = const Action._('THROW');
-
-  /** Call a supplied function. */
-  static const PROXY = const Action._('PROXY');
-
-  const Action._(this.name);
-
-  final String name;
-
-  String toString() => 'Action: $name';
-}