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

chrome/browser/chromeos/login/managed/managed_user_authenticator.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/login/managed/managed_user_authenticator.h"
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/chromeos/boot_times_loader.h"
 #include "chrome/browser/chromeos/login/parallel_authenticator.h"
 #include "chromeos/cryptohome/async_method_caller.h"
 #include "chromeos/cryptohome/system_salt_getter.h"
 #include "chromeos/dbus/cryptohome_client.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "crypto/sha2.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
 using content::BrowserThread;
 
 namespace chromeos {
 
 namespace {
 
-// Milliseconds until we timeout our attempt to hit ClientLogin.
-const int kClientLoginTimeoutMs = 10000;
-
 // Records status and calls resolver->Resolve().
 void TriggerResolve(ManagedUserAuthenticator::AuthAttempt* attempt,
                     scoped_refptr<ManagedUserAuthenticator> resolver,
                     bool success,
                     cryptohome::MountError return_code) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   attempt->RecordCryptohomeStatus(success, return_code);
   resolver->Resolve();
 }
 
@@ skipping 283 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   return hash_obtained_;
 }
 
 std::string ManagedUserAuthenticator::AuthAttempt::hash() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   return hash_;
 }
 
 }  // namespace chromeos