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

chrome/browser/chromeos/platform_keys/platform_keys_nss.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/platform_keys/platform_keys.h"
 
 #include <cert.h>
 #include <cryptohi.h>
 #include <keyhi.h>
 #include <secder.h>
@@ skipping 738 matching lines @@
 void SelectClientCertificates(const ClientCertificateRequest& request,
                               const SelectCertificatesCallback& callback,
                               content::BrowserContext* browser_context) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   scoped_refptr<net::SSLCertRequestInfo> cert_request_info(
       new net::SSLCertRequestInfo);
   cert_request_info->cert_key_types = request.certificate_key_types;
   cert_request_info->cert_authorities = request.certificate_authorities;
 
-  user_manager::User* user = chromeos::ProfileHelper::Get()->GetUserByProfile(
-      Profile::FromBrowserContext(browser_context));
+  const user_manager::User* user =
+      chromeos::ProfileHelper::Get()->GetUserByProfile(
+          Profile::FromBrowserContext(browser_context));
 
   // Use the device-wide system key slot only if the user is of the same
   // domain as the device is registered to.
   policy::BrowserPolicyConnectorChromeOS* connector =
       g_browser_process->platform_part()->browser_policy_connector_chromeos();
   bool use_system_key_slot = connector->GetUserAffiliation(user->email()) ==
                              policy::USER_AFFILIATION_MANAGED;
 
   scoped_ptr<SelectCertificatesState> state(new SelectCertificatesState(
       user->username_hash(), use_system_key_slot, cert_request_info, callback));
@@ skipping 103 matching lines @@
   NSSOperationState* state_ptr = state.get();
   GetCertDatabase(std::string() /* don't get any specific slot */,
                   base::Bind(&GetTokensWithDB, base::Passed(&state)),
                   browser_context,
                   state_ptr);
 }
 
 }  // namespace platform_keys
 
 }  // namespace chromeos