[Cleanup] Const-correct the profile() method for the EasyUnlockService

chrome/browser/chromeos/login/saml/saml_offline_signin_limiter.cc

 // Copyright 2014 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/saml/saml_offline_signin_limiter.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 123 matching lines @@
   offline_signin_limit_timer_.reset(
       new base::OneShotTimer<SAMLOfflineSigninLimiter>);
   offline_signin_limit_timer_->Start(
       FROM_HERE,
       offline_signin_time_limit - time_since_last_gaia_signin,
       this,
       &SAMLOfflineSigninLimiter::ForceOnlineLogin);
 }
 
 void SAMLOfflineSigninLimiter::ForceOnlineLogin() {
-  user_manager::User* user = ProfileHelper::Get()->GetUserByProfile(profile_);
+  const user_manager::User* user =
+      ProfileHelper::Get()->GetUserByProfile(profile_);
   if (!user) {
     NOTREACHED();
     return;
   }
 
   user_manager::UserManager::Get()->SaveForceOnlineSignin(user->email(), true);
   offline_signin_limit_timer_.reset();
 }
 
 }  // namespace chromeos