Add shutdown notification and service refs to SyncServiceObserver.

ios/chrome/browser/sync/sync_observer_bridge.mm

Index: ios/chrome/browser/sync/sync_observer_bridge.mm
diff --git a/ios/chrome/browser/sync/sync_observer_bridge.mm b/ios/chrome/browser/sync/sync_observer_bridge.mm
index ec4f248dbbeb7b7567ebe1ba20481fe1684d19d0..6afda764e41d3e641f85ebde4c809dcc1f4e5278 100644
--- a/ios/chrome/browser/sync/sync_observer_bridge.mm
+++ b/ios/chrome/browser/sync/sync_observer_bridge.mm
@@ -22,11 +22,12 @@ SyncObserverBridge::SyncObserverBridge(id<SyncObserverModelBridge> delegate,
 SyncObserverBridge::~SyncObserverBridge() {
 }
 
-void SyncObserverBridge::OnStateChanged() {
+void SyncObserverBridge::OnStateChanged(syncer::SyncService* sync) {
   [delegate_ onSyncStateChanged];
 }
 
-void SyncObserverBridge::OnSyncConfigurationCompleted() {
+void SyncObserverBridge::OnSyncConfigurationCompleted(
+    syncer::SyncService* sync) {
   if ([delegate_ respondsToSelector:@selector(onSyncConfigurationCompleted)])
     [delegate_ onSyncConfigurationCompleted];
 }