Provide warning message for setParameters

chromeos/dbus/shill_third_party_vpn_driver_client.h

 // Copyright 2014 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 CHROMEOS_DBUS_SHILL_THIRD_PARTY_VPN_DRIVER_CLIENT_H_
 #define CHROMEOS_DBUS_SHILL_THIRD_PARTY_VPN_DRIVER_CLIENT_H_
 
 #include <stdint.h>
 #include <string>
 #include <vector>
@@ skipping 38 matching lines @@
   // Removes an |observer| for the third party vpn driver at
   // |object_path_value|.
   virtual void RemoveShillThirdPartyVpnObserver(
       const std::string& object_path_value) = 0;
 
   // Calls SetParameters method.
   // |callback| is called after the method call succeeds.
   virtual void SetParameters(
       const std::string& object_path_value,
       const base::DictionaryValue& parameters,
-      const base::Closure& callback,
+      const ShillClientHelper::StringCallback& callback,
       const ShillClientHelper::ErrorCallback& error_callback) = 0;
 
   // Calls UpdateConnectionState method.
   // |callback| is called after the method call succeeds.
   virtual void UpdateConnectionState(
       const std::string& object_path_value,
       const uint32_t connection_state,
       const base::Closure& callback,
       const ShillClientHelper::ErrorCallback& error_callback) = 0;
 
@@ skipping 14 matching lines @@
   // Create() should be used instead.
   ShillThirdPartyVpnDriverClient();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShillThirdPartyVpnDriverClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_SHILL_THIRD_PARTY_VPN_DRIVER_CLIENT_H_