Refactor PPB_NetworkMonitor_Private interface to use CompletionCallback.

ppapi/utility/private/network_list_observer_private.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 "ppapi/utility/private/network_list_observer_private.h"
-
-#include "ppapi/cpp/private/network_list_private.h"
-#include "ppapi/cpp/module.h"
-
-namespace pp {
-
-NetworkListObserverPrivate::NetworkListObserverPrivate(
-    const InstanceHandle& instance)
-    : PP_ALLOW_THIS_IN_INITIALIZER_LIST(
-        monitor_(instance,
-                 &NetworkListObserverPrivate::NetworkListCallbackHandler,
-                 this)) {
-}
-
-NetworkListObserverPrivate::~NetworkListObserverPrivate() {
-}
-
-// static
-void NetworkListObserverPrivate::NetworkListCallbackHandler(
-    void* user_data,
-    PP_Resource list_resource) {
-  NetworkListObserverPrivate* object =
-      static_cast<NetworkListObserverPrivate*>(user_data);
-  NetworkListPrivate list(PASS_REF, list_resource);
-  object->OnNetworkListChanged(list);
-}
-
-}  // namespace pp