[Chromoting] Refactor the host policy watcher so that policies can easily be added.

remoting/host/policy_hack/mock_policy_callback.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "remoting/host/policy_hack/mock_policy_callback.h"
+
+namespace remoting {
+namespace policy_hack {
+
+MockPolicyCallback::MockPolicyCallback() {
+}
+
+MockPolicyCallback::~MockPolicyCallback() {
+}
+
+void MockPolicyCallback::OnPolicyUpdate(
+    scoped_ptr<base::DictionaryValue> policies) {
+  OnPolicyUpdatePtr(policies.get());
+}
+
+}  // namespace policy_hack
+}  // namespace remoting