signin: pull basic SigninManager functionality into new SigninManagerBase class.

chrome/browser/first_run/first_run.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/first_run/first_run.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 558 matching lines @@
 
     // Suppress the first run bubble if 'make chrome metro' flow is showing.
     if (contents->GetURL().host() == chrome::kChromeUIMetroFlowHost)
       return;
 
     // Suppress the first run bubble if the NTP sync promo bubble is showing
     // or if sign in is in progress.
     if (contents->GetURL().host() == chrome::kChromeUINewTabHost) {
       Profile* profile =
           Profile::FromBrowserContext(contents->GetBrowserContext());
-      SigninManager* manager =
+      SigninManagerBase* manager =
           SigninManagerFactory::GetForProfile(profile);
       bool signin_in_progress = manager &&
           (!manager->GetAuthenticatedUsername().empty() &&
               SigninTracker::GetSigninState(profile, NULL) !=
                   SigninTracker::SIGNIN_COMPLETE);
       bool is_promo_bubble_visible =
           profile->GetPrefs()->GetBoolean(prefs::kSyncPromoShowNTPBubble);
 
       if (is_promo_bubble_visible || signin_in_progress)
         return;
@@ skipping 208 matching lines @@
   internal::DoPostImportPlatformSpecificTasks();
 }
 
 bool DidPerformProfileImport(bool* exited_successfully) {
   if (exited_successfully)
     *exited_successfully = profile_import_exited_successfully;
   return did_perform_profile_import;
 }
 
 }  // namespace first_run