Tame the proliferation of UserContext constructors

chrome/browser/chromeos/login/managed/supervised_user_login_flow.cc

 // Copyright 2013 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/managed/supervised_user_login_flow.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 70 matching lines @@
                    weak_factory_.GetWeakPtr()),
         base::Bind(&SupervisedUserLoginFlow::OnPasswordChangeDataLoadFailed,
                    weak_factory_.GetWeakPtr()));
     return;
   }
   Finish();
 }
 
 void SupervisedUserLoginFlow::HandleLoginSuccess(
     const UserContext& login_context) {
-  context_.CopyFrom(login_context);
+  context_ = login_context;
 }
 
 void SupervisedUserLoginFlow::OnPasswordChangeDataLoaded(
     const base::DictionaryValue* password_data) {
   // Edge case, when manager has signed in and already updated the password.
   SupervisedUserAuthentication* auth =
       UserManager::Get()->GetSupervisedUserManager()->GetAuthentication();
   if (!auth->NeedPasswordChange(user_id(), password_data)) {
     VLOG(1) << "Password already changed for " << user_id();
     auth->ClearScheduledPasswordUpdate(user_id());
@@ skipping 147 matching lines @@
     Profile* profile) {
   profile_ = profile;
   UserManager::Get()->GetSupervisedUserManager()->LoadSupervisedUserToken(
       profile,
       base::Bind(
            &SupervisedUserLoginFlow::OnSyncSetupDataLoaded,
            weak_factory_.GetWeakPtr()));
 }
 
 }  // namespace chromeos