Convert NetworkState to IDL.

ppapi/api/dev/ppp_network_state_dev.idl

-/* Copyright (c) 2011 The Chromium Authors. All rights reserved.
+/* 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_C_DEV_PPP_NETWORK_STATE_DEV_H_
-#define PPAPI_C_DEV_PPP_NETWORK_STATE_DEV_H_
 
 /**
- * @file
  * This file defines the PPP_NetworkState interface.
  */
 
-#define PPP_NETWORK_STATE_DEV_INTERFACE "PPP_NetworkState(Dev);0.1"
+label Chrome {
+  M14 = 0.1
+};
 
-struct PPP_NetworkState_Dev {
+[macro="PPP_NETWORK_STATE_DEV_INTERFACE"]
+interface PPP_NetworkState_Dev {
   /**
    * Notification that the online state has changed for the user's network.
    * This will change as a result of a network cable being plugged or
    * unplugged, WiFi connections going up and down, or other events.
    *
    * Note that being "online" isn't a guarantee that any particular connections
    * will succeed.
    */
-  void (*SetOnLine)(PP_Bool is_online);
+  void SetOnLine([in] PP_Bool is_online);
 };
-
-#endif  // PPAPI_C_DEV_PPP_NETWORK_STATE_DEV_H_