Disconnect one click sign in code. The code itself will be removed in followup

chrome/browser/ui/sync/one_click_signin_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_HELPER_H_
 #define CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_HELPER_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
@@ skipping 317 matching lines @@
 
   // content::WebContentsObserver overrides.
   void DidStartNavigationToPendingEntry(
       const GURL& url,
       content::NavigationController::ReloadType reload_type) override;
   void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
   void DidStopLoading(content::RenderViewHost* render_view_host) override;
 
-  OneClickSigninSyncStarter::Callback CreateSyncStarterCallback();
-
-  // Callback invoked when OneClickSigninSyncStarter completes sync setup.
-  void SyncSetupCompletedCallback(
-      OneClickSigninSyncStarter::SyncSetupResult result);
-
   // Tracks if we are in the process of showing the signin or one click
   // interstitial page. It's set to true the first time we load one of those
   // pages and set to false when transient state is cleaned.
   // Note: This should only be used for logging purposes.
   bool showing_signin_;
 
   // Information about the account that has just logged in.
   std::string session_index_;
   std::string email_;
   std::string password_;
@@ skipping 23 matching lines @@
 
   // Allows unittest to avoid starting sync for real.
   bool do_not_start_sync_for_testing_;
 
   base::WeakPtrFactory<OneClickSigninHelper> weak_pointer_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OneClickSigninHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_HELPER_H_