[Cleanup] Clean up Easy Unlock code a bit.

chrome/browser/signin/easy_unlock_service_regular.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/signin/easy_unlock_service_regular.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
@@ skipping 255 matching lines @@
 
 void EasyUnlockServiceRegular::ShutdownInternal() {
 #if defined(OS_CHROMEOS)
   short_lived_user_context_.reset();
 #endif
 
   turn_off_flow_status_ = EasyUnlockService::IDLE;
   registrar_.RemoveAll();
 }
 
-bool EasyUnlockServiceRegular::IsAllowedInternal() {
+bool EasyUnlockServiceRegular::IsAllowedInternal() const {
 #if defined(OS_CHROMEOS)
   if (!user_manager::UserManager::Get()->IsLoggedInAsUserWithGaiaAccount())
     return false;
 
   if (!chromeos::ProfileHelper::IsPrimaryProfile(profile()))
     return false;
 
   if (!profile()->GetPrefs()->GetBoolean(prefs::kEasyUnlockAllowed))
     return false;
 
@@ skipping 42 matching lines @@
       new base::DictionaryValue());
   user_prefs_dict->SetBooleanWithoutPathExpansion(
       prefs::kEasyUnlockProximityRequired,
       profile_prefs->GetBoolean(prefs::kEasyUnlockProximityRequired));
 
   DictionaryPrefUpdate update(local_state,
                               prefs::kEasyUnlockLocalStateUserPrefs);
   std::string user_email = GetUserEmail();
   update->SetWithoutPathExpansion(user_email, user_prefs_dict.Pass());
 }