Add shutdown notification and service refs to SyncServiceObserver.

components/suggestions/suggestions_service_impl.cc

Index: components/suggestions/suggestions_service_impl.cc
diff --git a/components/suggestions/suggestions_service_impl.cc b/components/suggestions/suggestions_service_impl.cc
index 5f30527c68bed1804c66139fcf5e696ebfa879bf..a9afade8e4ce91c1ff16d688a98f5478ee4b07e9 100644
--- a/components/suggestions/suggestions_service_impl.cc
+++ b/components/suggestions/suggestions_service_impl.cc
@@ -209,7 +209,7 @@ SuggestionsServiceImpl::SuggestionsServiceImpl(
     sync_service_observer_.Add(sync_service_);
   // Immediately get the current sync state, so we'll flush the cache if
   // necessary.
-  OnStateChanged();
+  OnStateChanged(sync_service_);
 }
 
 SuggestionsServiceImpl::~SuggestionsServiceImpl() {}
@@ -348,7 +348,7 @@ GURL SuggestionsServiceImpl::BuildSuggestionsBlacklistClearURL() {
                                  kDeviceType));
 }
 
-void SuggestionsServiceImpl::OnStateChanged() {
+void SuggestionsServiceImpl::OnStateChanged(syncer::SyncService* sync) {
   switch (GetSyncState(sync_service_)) {
     case SYNC_OR_HISTORY_SYNC_DISABLED:
       // Cancel any ongoing request, to stop interacting with the server.