Move UserContext to its own file

chrome/browser/chromeos/login/auth/online_attempt_host.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/auth/online_attempt_host.h"
 
 #include "base/bind.h"
 #include "base/sha1.h"
 #include "chrome/browser/chromeos/login/auth/auth_attempt_state.h"
 #include "chrome/browser/chromeos/login/auth/online_attempt.h"
+#include "chrome/browser/chromeos/login/auth/user_context.h"
 #include "chrome/browser/chromeos/login/users/user.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace chromeos {
 
 OnlineAttemptHost::OnlineAttemptHost(Delegate* delegate)
     : delegate_(delegate), weak_ptr_factory_(this) {}
 
 OnlineAttemptHost::~OnlineAttemptHost() {
@@ skipping 40 matching lines @@
   }
 }
 
 void OnlineAttemptHost::ResolveOnUIThread(bool success) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   delegate_->OnChecked(current_username_, success);
   Reset();
 }
 
 }  // namespace chromeos