signin: pull basic SigninManager functionality into new SigninManagerBase class.

chrome/browser/ui/auto_login_prompter.cc

 // Copyright (c) 2012 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/ui/auto_login_prompter.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
@@ skipping 24 matching lines @@
   // In an incognito window, there may not be a profile sync service and/or
   // signin manager.
   if (!ProfileSyncServiceFactory::GetInstance()->HasProfileSyncService(
       profile)) {
     return false;
   }
 
   if (!TokenServiceFactory::GetForProfile(profile)->AreCredentialsValid())
     return false;
 
-  SigninManager* signin_manager =
+  SigninManagerBase* signin_manager =
       SigninManagerFactory::GetInstance()->GetForProfile(profile);
   if (!signin_manager)
     return false;
 
   *output = signin_manager->GetAuthenticatedUsername();
   return true;
 }
 
 }  // namespace
 
@@ skipping 91 matching lines @@
     return;
 
   InfoBarService* infobar_service =
       InfoBarService::FromWebContents(web_contents());
   // |infobar_service| is NULL for WebContents hosted in WebDialog.
   if (infobar_service) {
     AutoLoginInfoBarDelegate::Create(infobar_service, params_);
     infobar_shown_ = true;
   }
 }