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

components/browser_sync/profile_sync_service.cc

Index: components/browser_sync/profile_sync_service.cc
diff --git a/components/browser_sync/profile_sync_service.cc b/components/browser_sync/profile_sync_service.cc
index 0bf8b696ee84cd1cba28b03c9445e1e5727954d8..a684271b0213ccd5107375301d27cfa6e1888e5b 100644
--- a/components/browser_sync/profile_sync_service.cc
+++ b/components/browser_sync/profile_sync_service.cc
@@ -2161,6 +2161,10 @@ void ProfileSyncService::GetAllNodes(
   }
 }
 
+syncer::GlobalIdMapper* ProfileSyncService::GetGlobalIdMapper() const {
+  return sessions_sync_manager_.get();
+}
+
 base::WeakPtr<syncer::JsController> ProfileSyncService::GetJsController() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return sync_js_controller_.AsWeakPtr();