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

chrome/browser/chromeos/login/signin/auth_sync_observer.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/login/signin/auth_sync_observer.h"
 
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/chromeos/login/users/chrome_user_manager.h"
@@ skipping 30 matching lines @@
       ProfileSyncServiceFactory::GetForProfile(profile_);
   if (sync_service)
     sync_service->RemoveObserver(this);
 }
 
 void AuthSyncObserver::OnStateChanged() {
   DCHECK(user_manager::UserManager::Get()->IsLoggedInAsUserWithGaiaAccount() ||
          user_manager::UserManager::Get()->IsLoggedInAsSupervisedUser());
   ProfileSyncService* sync_service =
       ProfileSyncServiceFactory::GetForProfile(profile_);
-  user_manager::User* user = ProfileHelper::Get()->GetUserByProfile(profile_);
+  const user_manager::User* user =
+      ProfileHelper::Get()->GetUserByProfile(profile_);
   GoogleServiceAuthError::State state =
       sync_service->GetAuthError().state();
   if (state != GoogleServiceAuthError::NONE &&
       state != GoogleServiceAuthError::CONNECTION_FAILED &&
       state != GoogleServiceAuthError::SERVICE_UNAVAILABLE &&
       state != GoogleServiceAuthError::REQUEST_CANCELED) {
     // Invalidate OAuth2 refresh token to force Gaia sign-in flow. This is
     // needed because sign-out/sign-in solution is suggested to the user.
     // TODO(nkostylev): Remove after crosbug.com/25978 is implemented.
     LOG(WARNING) << "Invalidate OAuth token because of a sync error: "
@@ skipping 30 matching lines @@
     }
   }
 }
 
 void AuthSyncObserver::OnSupervisedTokenLoaded(const std::string& token) {
   ChromeUserManager::Get()->GetSupervisedUserManager()->ConfigureSyncWithToken(
       profile_, token);
 }
 
 }  // namespace chromeos