Record the initial state of the Physical Web at startup

ios/chrome/browser/physical_web/create_physical_web_data_source.mm

 // Copyright 2016 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 "ios/chrome/browser/physical_web/create_physical_web_data_source.h"
 
 #include "base/memory/ptr_util.h"
 #import "ios/chrome/browser/physical_web/ios_chrome_physical_web_data_source.h"
 
 std::unique_ptr<physical_web::PhysicalWebDataSource>
-CreateIOSChromePhysicalWebDataSource() {
-  std::unique_ptr<physical_web::PhysicalWebDataSource> datasource =
-      base::MakeUnique<IOSChromePhysicalWebDataSource>();
-  return datasource;
+CreateIOSChromePhysicalWebDataSource(PrefService* prefService) {
+  return base::MakeUnique<IOSChromePhysicalWebDataSource>(prefService);
 }