Tiny: Check if the local DB manager is still enabled before scheduling update

BUG=630784, 543161

Review-Url: https://codereview.chromium.org/2181583004
Cr-Commit-Position: refs/heads/master@{#407526}

components/safe_browsing_db/v4_local_database_manager.cc

@@ -261,8 +261,10 @@ void V4LocalDatabaseManager::UpdateRequestCompleted(
 }
 
 void V4LocalDatabaseManager::DatabaseUpdated() {
-  v4_update_protocol_manager_->ScheduleNextUpdate(
-      v4_database_->GetStoreStateMap());
+  if (enabled_) {
+    v4_update_protocol_manager_->ScheduleNextUpdate(
+        v4_database_->GetStoreStateMap());
+  }
 }
 
 }  // namespace safe_browsing