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

chrome/browser/profiles/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.
 
 // This class gathers state related to a single user profile.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 
 #include <string>
@@ skipping 87 matching lines @@
   bool IsOffTheRecord() 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;
   chrome::ChromeZoomLevelPrefs* GetZoomLevelPrefs() override;
   PrefService* GetOffTheRecordPrefs() override;
   net::URLRequestContextGetter* GetRequestContextForExtensions() override;
   net::SSLConfigService* GetSSLConfigService() override;
   HostContentSettingsMap* GetHostContentSettingsMap() override;
   bool IsSameProfile(Profile* profile) override;
   base::Time GetStartTime() const override;
   net::URLRequestContextGetter* CreateRequestContext(
       content::ProtocolHandlerMap* protocol_handlers,
       content::URLRequestInterceptorScopedVector request_interceptors) override;
@@ skipping 154 matching lines @@
   // components/keyed_service/content/browser_context_keyed_service_factory.*
 
   Profile::Delegate* delegate_;
 
   chrome_browser_net::Predictor* predictor_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImpl);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_