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

chrome/browser/signin/signin_manager_factory.h

 // 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.
 
 #ifndef CHROME_BROWSER_SIGNIN_SIGNIN_MANAGER_FACTORY_H_
 #define CHROME_BROWSER_SIGNIN_SIGNIN_MANAGER_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "base/observer_list.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
@@ skipping 24 matching lines @@
 #if defined(OS_CHROMEOS)
   // Returns the instance of SigninManager associated with this profile
   // (creating one if none exists). Returns NULL if this profile cannot have a
   // SigninManager (for example, if |profile| is incognito).
   static SigninManagerBase* GetForProfile(Profile* profile);
 
   // Returns the instance of SigninManager associated with this profile. Returns
   // null if no SigninManager instance currently exists (will not create a new
   // instance).
   static SigninManagerBase* GetForProfileIfExists(Profile* profile);
+  static const SigninManagerBase* GetForProfileIfExists(const Profile* profile);
 #else
   // On non-ChromeOS platforms, the SigninManager the factory creates will be
   // an instance of the extended SigninManager class.
   static SigninManager* GetForProfile(Profile* profile);
   static SigninManager* GetForProfileIfExists(Profile* profile);
+  static const SigninManager* GetForProfileIfExists(const Profile* profile);
 #endif
 
   // Returns an instance of the SigninManagerFactory singleton.
   static SigninManagerFactory* GetInstance();
 
   // Implementation of BrowserContextKeyedServiceFactory (public so tests
   // can call it).
   void RegisterProfilePrefs(
       user_prefs::PrefRegistrySyncable* registry) override;
 
@@ skipping 19 matching lines @@
   // List of observers. Checks that list is empty on destruction.
   mutable ObserverList<Observer, true> observer_list_;
 
   // BrowserContextKeyedServiceFactory:
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
   void BrowserContextShutdown(content::BrowserContext* context) override;
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_MANAGER_FACTORY_H_