linux and chromeos: Turn on -Wunused-const-variable.

chromeos/network/network_device_handler.cc

 // Copyright 2013 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 "chromeos/network/network_device_handler.h"
 
 #include "base/bind.h"
 #include "base/values.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/shill_device_client.h"
 #include "chromeos/dbus/shill_ipconfig_client.h"
 #include "chromeos/network/device_state.h"
 #include "chromeos/network/network_event_log.h"
 #include "dbus/object_path.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
 namespace chromeos {
 
 namespace {
 
-const char kDevicePath[] = "devicePath";
-
 // TODO(armansito): Add bindings for these to service_constants.h
 // (crbug.com/256889)
 const char kShillErrorFailure[] = "org.chromium.flimflam.Error.Failure";
 const char kShillErrorNotSupported[] =
     "org.chromium.flimflam.Error.NotSupported";
 
 std::string GetErrorNameForShillError(const std::string& shill_error_name) {
   // TODO(armansito): Use the new SIM error names once the ones below get
   // deprecated (crbug.com/256855)
   if (shill_error_name == kShillErrorFailure)
@@ skipping 226 matching lines @@
 void NetworkDeviceHandler::HandleShillCallFailureForTest(
     const std::string& device_path,
     const network_handler::ErrorCallback& error_callback,
     const std::string& shill_error_name,
     const std::string& shill_error_message) {
   HandleShillCallFailure(
       device_path, error_callback, shill_error_name, shill_error_message);
 }
 
 }  // namespace chromeos