Pass Setup Chrome Sync to main profile from Incognito.

chrome/browser/ui/browser.cc

 // Copyright (c) 2011 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/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // OS_WIN
@@ skipping 4774 matching lines @@
   }
 
   BookmarkBar::AnimateChangeType animate_type =
       (reason == BOOKMARK_BAR_STATE_CHANGE_PREF_CHANGE) ?
       BookmarkBar::ANIMATE_STATE_CHANGE :
       BookmarkBar::DONT_ANIMATE_STATE_CHANGE;
   window_->BookmarkBarStateChanged(animate_type);
 }
 
 void Browser::ShowSyncSetup() {
-  ProfileSyncService* service = profile()->GetProfileSyncService();
+  ProfileSyncService* service =
+      profile()->GetOriginalProfile()->GetProfileSyncService();
   if (service->HasSyncSetupCompleted())
     ShowOptionsTab(chrome::kSyncSetupSubPage);
   else
-    profile()->GetProfileSyncService()->ShowLoginDialog();
+    service->ShowLoginDialog();
 }