Revert "Revert 142517 - [Sync] Refactor sync configuration logic."

chrome/browser/sync/profile_sync_service.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/sync/profile_sync_service.h"
 
 #include <cstddef>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 334 matching lines @@
     new browser_sync::BackendUnrecoverableErrorHandler(
         MakeWeakHandle(weak_factory_.GetWeakPtr())));
 
   backend_->Initialize(
       this,
       MakeWeakHandle(sync_js_controller_.AsWeakPtr()),
       sync_service_url_,
       initial_types,
       credentials,
       delete_stale_data,
+      &sync_manager_factory_,
       backend_unrecoverable_error_handler_.get(),
       &browser_sync::ChromeReportUnrecoverableError);
 }
 
 void ProfileSyncService::CreateBackend() {
   backend_.reset(
       new SyncBackendHost(profile_->GetDebugName(),
                           profile_, sync_prefs_.AsWeakPtr(),
                           invalidator_storage_.AsWeakPtr()));
 }
@@ skipping 1357 matching lines @@
   // See http://stackoverflow.com/questions/6224121/is-new-this-myclass-undefined-behaviour-after-directly-calling-the-destru.
   ProfileSyncService* old_this = this;
   this->~ProfileSyncService();
   new(old_this) ProfileSyncService(
       new ProfileSyncComponentsFactoryImpl(profile,
                                            CommandLine::ForCurrentProcess()),
       profile,
       signin,
       behavior);
 }