Add shutdown notification and service refs to SyncServiceObserver.

chrome/browser/sync_file_system/sync_file_system_service.cc

Index: chrome/browser/sync_file_system/sync_file_system_service.cc
diff --git a/chrome/browser/sync_file_system/sync_file_system_service.cc b/chrome/browser/sync_file_system/sync_file_system_service.cc
index d9666744e376f6e72aa20c55ad2a0a83f8bdb7b0..1b890f073e8ce0d41c532d36559d31b3c6574c46 100644
--- a/chrome/browser/sync_file_system/sync_file_system_service.cc
+++ b/chrome/browser/sync_file_system/sync_file_system_service.cc
@@ -728,7 +728,7 @@ void SyncFileSystemService::OnExtensionLoaded(
   local_service_->SetOriginEnabled(app_origin, true);
 }
 
-void SyncFileSystemService::OnStateChanged() {
+void SyncFileSystemService::OnStateChanged(syncer::SyncService* sync) {
   syncer::SyncService* profile_sync_service =

[skym, 2017/01/26 23:43:23]

This variable can be replaced by |sync|.

[Steven Holte, 2017/01/27 02:27:19]

Done.

       ProfileSyncServiceFactory::GetSyncServiceForBrowserContext(profile_);
   if (profile_sync_service)

[skym, 2017/01/26 23:43:23]

Same for this if

[Steven Holte, 2017/01/27 02:27:19]

Done.