Make SyncBackendRegistrar aware of loaded data

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 309 matching lines @@
   }
   return credentials;
 }
 
 void ProfileSyncService::InitializeBackend(bool delete_stale_data) {
   if (!backend_.get()) {
     NOTREACHED();
     return;
   }
 
-  syncer::ModelTypeSet initial_types;
-  // If sync setup hasn't finished, we don't want to initialize routing info
-  // for any data types so that we don't download updates for types that the
-  // user chooses not to sync on the first DownloadUpdatesCommand.
-  if (HasSyncSetupCompleted()) {
-    initial_types = GetPreferredDataTypes();
-  }
-
   SyncCredentials credentials = GetCredentials();
 
   scoped_refptr<net::URLRequestContextGetter> request_context_getter(
       profile_->GetRequestContext());
 
   if (delete_stale_data)
     ClearStaleErrors();
 
   backend_unrecoverable_error_handler_.reset(
     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(),
@@ skipping 1395 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);
 }