Refactor PPB_NetworkMonitor_Private interface to use CompletionCallback.

ppapi/utility/private/network_list_observer_private.h

-// 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.
-
-#ifndef PPAPI_UTILITY_PRIVATE_NETWORK_LIST_OBSERVER_H_
-#define PPAPI_UTILITY_PRIVATE_NETWORK_LIST_OBSERVER_H_
-
-#include "ppapi/cpp/private/network_monitor_private.h"
-
-namespace pp {
-
-class NetworkListPrivate;
-
-/// <code>NetworkListObserver</code> is a wrapper for
-/// <code>pp::NetworkMonitorPrivate</code> that makes it easier to
-/// handle network list update notifications. A child class must
-/// implement the <code>OnNetworkListChanged()</code> method. That
-/// method will be called once after the object is created and then
-/// every time network configuration changes.
-class NetworkListObserverPrivate {
- public:
-  explicit NetworkListObserverPrivate(const InstanceHandle& instance);
-  virtual ~NetworkListObserverPrivate();
-
- protected:
-  /// Called once after this object is created and later every time
-  /// network configuration changes. Child classes must implement this
-  /// method.
-  ///
-  /// @param[in] list The current list of network interfaces.
-  virtual void OnNetworkListChanged(const NetworkListPrivate& list) = 0;
-
- private:
-  // Private copy constructor and assign operator to disallow copying of this
-  // object. This is necessary to guarantee that |monitor_| is not shared with
-  // another list observer and is always destroyed when this object is
-  // destroyed.
-  NetworkListObserverPrivate(const NetworkListObserverPrivate&);
-  void operator=(const NetworkListObserverPrivate&);
-
-  static void NetworkListCallbackHandler(void* user_data,
-                                         PP_Resource list_resource);
-
-  NetworkMonitorPrivate monitor_;
-};
-
-}  // namespace pp
-
-#endif  // PPAPI_UTILITY_PRIVATE_NETWORK_LIST_OBSERVER_H_