Replace direct access to kGoogleServicesUsername with calls to SigninManager.

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

Index: chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
diff --git a/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc b/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
index e8efbfedfef1954cbf12f3688d706fc5917016ac..56503cccb0265f02f3df09be728241b6c2993548 100644
--- a/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
+++ b/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
@@ -36,11 +36,13 @@
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/notifications/notification_ui_manager.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_util.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/chromeos_switches.h"
+#include "components/signin/core/browser/signin_manager.h"
 #include "components/user_manager/user_manager.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/test/test_utils.h"
@@ -1204,8 +1206,9 @@ class MultiProfileFileManagerBrowserTest : public FileManagerBrowserTestBase {
       user_manager->UserLoggedIn(info.email, info.hash, false);
     user_manager->SaveUserDisplayName(info.email,
                                       base::UTF8ToUTF16(info.display_name));
-    chromeos::ProfileHelper::GetProfileByUserIdHash(info.hash)->GetPrefs()->
-        SetString(prefs::kGoogleServicesUsername, info.email);
+    SigninManagerFactory::GetForProfile(
+        chromeos::ProfileHelper::GetProfileByUserIdHash(info.hash))->
+            SetAuthenticatedUsername(info.email);
   }
 
  private: