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

chrome/browser/chromeos/status/data_promo_notification.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/status/data_promo_notification.h"
 
 #include "ash/system/chromeos/network/network_connect.h"
 #include "ash/system/system_notifier.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
@@ skipping 22 matching lines @@
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/notification.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace chromeos {
 
 namespace {
 
-// Time in milliseconds to delay showing of promo
-// notification when Chrome window is not on screen.
-const int kPromoShowDelayMs = 10000;
-
 const int kNotificationCountPrefDefault = -1;
 
 bool GetBooleanPref(const char* pref_name) {
   Profile* profile = ProfileManager::GetDefaultProfileOrOffTheRecord();
   PrefService* prefs = profile->GetPrefs();
   return prefs->GetBoolean(pref_name);
 }
 
 int GetIntegerLocalPref(const char* pref_name) {
   PrefService* prefs = g_browser_process->local_state();
@@ skipping 170 matching lines @@
           base::Bind(&NotificationClicked,
                      default_network->path(), info_url)));
 
   check_for_promo_ = false;
   SetShow3gPromoNotification(false);
   if (carrier_deal_promo_pref != kNotificationCountPrefDefault)
     SetCarrierDealPromoShown(carrier_deal_promo_pref + 1);
 }
 
 }  // namespace chromeos