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

chrome/browser/chromeos/options/vpn_config_view.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/options/vpn_config_view.h"
 
 #include "ash/system/chromeos/network/network_connect.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 21 matching lines @@
 #include "ui/views/controls/combobox/combobox.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/controls/textfield/textfield.h"
 #include "ui/views/layout/grid_layout.h"
 #include "ui/views/layout/layout_constants.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/window/dialog_client_view.h"
 
 namespace {
 
-// Root CA certificates that are built into Chrome use this token name.
-const char* const kRootCertificateTokenName = "Builtin Object Token";
-
 enum ProviderTypeIndex {
   PROVIDER_TYPE_INDEX_L2TP_IPSEC_PSK = 0,
   PROVIDER_TYPE_INDEX_L2TP_IPSEC_USER_CERT = 1,
   PROVIDER_TYPE_INDEX_OPEN_VPN = 2,
   PROVIDER_TYPE_INDEX_MAX = 3,
 };
 
 string16 ProviderTypeIndexToString(int index) {
   switch (index) {
     case PROVIDER_TYPE_INDEX_L2TP_IPSEC_PSK:
@@ skipping 998 matching lines @@
   property_ui_data->ParseOncProperty(
       onc_source,
       onc,
       base::StringPrintf("%s.%s.%s",
                          ::onc::network_config::kVPN,
                          dict_key.c_str(),
                          key.c_str()));
 }
 
 }  // namespace chromeos