Replace direct access to kGoogleServicesUsername with calls to SigninManager.

chrome/browser/supervised_user/custodian_profile_downloader_service.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/supervised_user/custodian_profile_downloader_service.h"
 
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/common/pref_names.h"
+#include "components/signin/core/browser/signin_manager.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 
 CustodianProfileDownloaderService::CustodianProfileDownloaderService(
     Profile* custodian_profile)
         : custodian_profile_(custodian_profile) {
 }
 
 CustodianProfileDownloaderService::~CustodianProfileDownloaderService() {}
 
 void CustodianProfileDownloaderService::Shutdown() {
   profile_downloader_.reset();
 }
 
 void CustodianProfileDownloaderService::DownloadProfile(
     const DownloadProfileCallback& callback) {
   // The user must be logged in.
-  std::string username = custodian_profile_->GetPrefs()->GetString(
-      prefs::kGoogleServicesUsername);
-  if (username.empty())
+  if (!SigninManagerFactory::GetForProfile(custodian_profile_)
+          ->IsAuthenticated()) {
     return;
+  }
 
   download_callback_ = callback;
   std::string current_email = custodian_profile_->GetProfileName();
   if (gaia::AreEmailsSame(last_downloaded_profile_email_, current_email)) {
     // Profile was previously downloaded successfully, use it as it is unlikely
     // that we will need to download it again.
     OnProfileDownloadSuccess(profile_downloader_.get());
     return;
   }
   // If another profile download is in progress, drop it. It's not worth
@@ skipping 28 matching lines @@
   last_downloaded_profile_email_ = in_progress_profile_email_;
 }
 
 void CustodianProfileDownloaderService::OnProfileDownloadFailure(
     ProfileDownloader* downloader,
     ProfileDownloaderDelegate::FailureReason reason) {
   // Ignore failures; proceed without the custodian's name.
   download_callback_.Reset();
   profile_downloader_.reset();
 }