Service Worker: Update stale workers

content/browser/service_worker/service_worker_context_core.cc

Index: content/browser/service_worker/service_worker_context_core.cc
diff --git a/content/browser/service_worker/service_worker_context_core.cc b/content/browser/service_worker/service_worker_context_core.cc
index d4ba0a34daf693fa1e8cc0426af972e80dd5597b..439011719e777b4ab73edd1cf3175754fc0d69de 100644
--- a/content/browser/service_worker/service_worker_context_core.cc
+++ b/content/browser/service_worker/service_worker_context_core.cc
@@ -437,6 +437,20 @@ ServiceWorkerContextCore::GetAllLiveVersionInfo() {
   return infos;
 }
 
+void ServiceWorkerContextCore::ProtectVersion(
+    const scoped_refptr<ServiceWorkerVersion>& version) {
+  DCHECK(protected_versions_.find(version->version_id()) ==
+         protected_versions_.end());
+  protected_versions_[version->version_id()] = version;
+}
+
+void ServiceWorkerContextCore::UnprotectVersion(
+    const scoped_refptr<ServiceWorkerVersion>& version) {
+  DCHECK(protected_versions_.find(version->version_id()) !=
+         protected_versions_.end());
+  protected_versions_.erase(version->version_id());
+}
+
 int ServiceWorkerContextCore::GetNewServiceWorkerHandleId() {
   return next_handle_id_++;
 }