Tame the proliferation of UserContext constructors

chrome/browser/chromeos/login/users/user_manager_impl.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/users/user_manager_impl.h"
 
 #include <cstddef>
 #include <set>
 
 #include "ash/multi_profile_uma.h"
@@ skipping 1996 matching lines @@
        it != logged_in_users.end(); ++it) {
     const User* user = (*it);
     if (user->email() == user_id) {
       user_already_logged_in = true;
       break;
     }
   }
   DCHECK(!user_already_logged_in);
 
   if (!user_already_logged_in) {
+    UserContext user_context(user_id);
+    user_context.SetUserIDHash(user_id_hash);
+    user_context.SetIsUsingOAuth(false);
     // Will call OnProfilePrepared() once profile has been loaded.
-    LoginUtils::Get()->PrepareProfile(
-        UserContext(user_id,
-                    std::string(),  // password
-                    std::string(),  // auth_code
-                    user_id_hash,
-                    false,         // using_oauth
-                    UserContext::AUTH_FLOW_OFFLINE),
-        std::string(),  // display_email
-        false,          // has_cookies
-        true,           // has_active_session
-        this);
+    LoginUtils::Get()->PrepareProfile(user_context,
+                                      std::string(),  // display_email
+                                      false,          // has_cookies
+                                      true,           // has_active_session
+                                      this);
   } else {
     RestorePendingUserSessions();
   }
 }
 
 void UserManagerImpl::SendRegularUserLoginMetrics(const std::string& user_id) {
   // If this isn't the first time Chrome was run after the system booted,
   // assume that Chrome was restarted because a previous session ended.
   if (!CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kFirstExecAfterBoot)) {
@@ skipping 50 matching lines @@
 }
 
 void UserManagerImpl::DeleteUser(User* user) {
   const bool is_active_user = (user == active_user_);
   delete user;
   if (is_active_user)
     active_user_ = NULL;
 }
 
 }  // namespace chromeos