[Sync] Maintain a global_id mapping to update UserEvents that references navigations

ios/chrome/browser/sync/ios_user_event_service_factory.cc

 // Copyright 2017 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/sync/ios_user_event_service_factory.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
@@ skipping 37 matching lines @@
     return base::MakeUnique<syncer::NoOpUserEventService>();
   }
 
   syncer::ModelTypeStoreFactory store_factory =
       browser_sync::ProfileSyncService::GetModelTypeStoreFactory(
           syncer::USER_EVENTS, browser_state->GetStatePath());
   syncer::ModelTypeSyncBridge::ChangeProcessorFactory processor_factory =
       base::BindRepeating(&syncer::ModelTypeChangeProcessor::Create,
                           base::BindRepeating(&syncer::ReportUnrecoverableError,
                                               ::GetChannel()));
+  syncer::SyncService* sync_service =
+      IOSChromeProfileSyncServiceFactory::GetForBrowserState(
+          ios::ChromeBrowserState::FromBrowserState(browser_state));
   auto bridge = base::MakeUnique<syncer::UserEventSyncBridge>(
-      std::move(store_factory), std::move(processor_factory));
-  return base::MakeUnique<syncer::UserEventServiceImpl>(
-      IOSChromeProfileSyncServiceFactory::GetForBrowserState(
-          ios::ChromeBrowserState::FromBrowserState(browser_state)),
-      std::move(bridge));
+      std::move(store_factory), std::move(processor_factory),
+      sync_service->GetGlobalIdMapper());
+  return base::MakeUnique<syncer::UserEventServiceImpl>(sync_service,
+                                                        std::move(bridge));
 }
 
 web::BrowserState* IOSUserEventServiceFactory::GetBrowserStateToUse(
     web::BrowserState* context) const {
   return GetBrowserStateOwnInstanceInIncognito(context);
 }