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

chromeos/network/network_sms_handler.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 "chromeos/network/network_sms_handler.h"
 
 #include <algorithm>
 #include <deque>
 #include <string>
 #include <vector>
 
 #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_manager_client.h"
 #include "chromeos/dbus/gsm_sms_client.h"
 #include "chromeos/dbus/modem_messaging_client.h"
 #include "chromeos/dbus/sms_client.h"
 #include "dbus/object_path.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
 namespace {
 
 // Not exposed/exported:
-const char kSmscKey[] = "smsc";
-const char kValidityKey[] = "validity";
-const char kClassKey[] = "class";
 const char kIndexKey[] = "index";
 
 // Keys from ModemManager1
 const char kModemManager1NumberKey[] = "Number";
 const char kModemManager1TextKey[] = "Text";
 const char kModemManager1TimestampKey[] = "Timestamp";
 
 // Maximum number of messages stored for RequestUpdate(true).
 const size_t kMaxReceivedMessages = 100;
 
@@ skipping 443 matching lines @@
             this, dbus_connection, object_path));
   } else {
     device_handlers_.push_back(
         new ModemManagerNetworkSmsDeviceHandler(
             this, dbus_connection, object_path));
   }
 }
 
 
 }  // namespace chromeos