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

chrome/browser/profiles/off_the_record_profile_impl.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_PROFILES_OFF_THE_RECORD_PROFILE_IMPL_H_
 #define CHROME_BROWSER_PROFILES_OFF_THE_RECORD_PROFILE_IMPL_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
@@ skipping 30 matching lines @@
   ProfileType GetProfileType() const override;
   Profile* GetOffTheRecordProfile() override;
   void DestroyOffTheRecordProfile() override;
   bool HasOffTheRecordProfile() override;
   Profile* GetOriginalProfile() override;
   bool IsSupervised() override;
   bool IsChild() override;
   bool IsLegacySupervised() override;
   ExtensionSpecialStoragePolicy* GetExtensionSpecialStoragePolicy() override;
   PrefService* GetPrefs() override;
+  const PrefService* GetPrefs() const override;
   PrefService* GetOffTheRecordPrefs() override;
   net::URLRequestContextGetter* GetRequestContextForExtensions() override;
   net::URLRequestContextGetter* CreateRequestContext(
       content::ProtocolHandlerMap* protocol_handlers,
       content::URLRequestInterceptorScopedVector request_interceptors) override;
   net::URLRequestContextGetter* CreateRequestContextForStoragePartition(
       const base::FilePath& partition_path,
       bool in_memory,
       content::ProtocolHandlerMap* protocol_handlers,
       content::URLRequestInterceptorScopedVector request_interceptors) override;
@@ skipping 77 matching lines @@
   Time start_time_;
 
   base::FilePath last_selected_directory_;
 
   scoped_ptr<PrefProxyConfigTracker> pref_proxy_config_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(OffTheRecordProfileImpl);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_OFF_THE_RECORD_PROFILE_IMPL_H_