Add shutdown notification and service refs to SyncServiceObserver.

chrome/browser/ui/webui/foreign_session_handler.cc

Index: chrome/browser/ui/webui/foreign_session_handler.cc
diff --git a/chrome/browser/ui/webui/foreign_session_handler.cc b/chrome/browser/ui/webui/foreign_session_handler.cc
index df6d2570780cc5eec87ba54ca7fba353f4f2b1bf..a20538f62d93aac64164bc7fffba8e2f5ff9caab 100644
--- a/chrome/browser/ui/webui/foreign_session_handler.cc
+++ b/chrome/browser/ui/webui/foreign_session_handler.cc
@@ -229,11 +229,12 @@ void ForeignSessionHandler::RegisterMessages() {
                  base::Unretained(this)));
 }
 
-void ForeignSessionHandler::OnSyncConfigurationCompleted() {
+void ForeignSessionHandler::OnSyncConfigurationCompleted(
+    syncer::SyncService* sync) {
   HandleGetForeignSessions(nullptr);
 }
 
-void ForeignSessionHandler::OnForeignSessionUpdated() {
+void ForeignSessionHandler::OnForeignSessionUpdated(syncer::SyncService* sync) {
   HandleGetForeignSessions(nullptr);
 }