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

chrome/browser/chromeos/kiosk_mode/kiosk_mode_idle_logout.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 "chrome/browser/chromeos/kiosk_mode/kiosk_mode_idle_logout.h"
 
 #include "ash/shell.h"
 #include "ash/wm/user_activity_detector.h"
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_settings.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/ui/idle_logout_dialog_view.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 
 namespace chromeos {
 
 namespace {
 
-const int64 kLoginIdleTimeout = 100; // seconds
-
 static base::LazyInstance<KioskModeIdleLogout>
     g_kiosk_mode_idle_logout = LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 // static
 void KioskModeIdleLogout::Initialize() {
   g_kiosk_mode_idle_logout.Get();
 }
 
@@ skipping 54 matching lines @@
                  base::Bind(&KioskModeIdleLogout::OnTimeout,
                             base::Unretained(this)));
   }
 }
 
 void KioskModeIdleLogout::OnTimeout() {
   IdleLogoutDialogView::ShowDialog();
 }
 
 }  // namespace chromeos