Don't prematurely delete script resources when registration is deleted

content/browser/service_worker/service_worker_database.h

Index: content/browser/service_worker/service_worker_database.h
diff --git a/content/browser/service_worker/service_worker_database.h b/content/browser/service_worker/service_worker_database.h
index 6475de04a99e759663456c9224fb40f568eca388..13b9b8cfe54f154d6cf35cea5d42b2418cfbe145 100644
--- a/content/browser/service_worker/service_worker_database.h
+++ b/content/browser/service_worker/service_worker_database.h
@@ -137,12 +137,14 @@ class CONTENT_EXPORT ServiceWorkerDatabase {
       const base::Time& time);
 
   // Deletes a registration for |registration_id| and moves resource records
-  // associated with it into the purgeable list. Returns OK if it's successfully
-  // deleted or not found in the database. Otherwise, returns an error.
-  Status DeleteRegistration(
-      int64 registration_id,
-      const GURL& origin,
-      std::vector<int64>* newly_purgeable_resources);
+  // associated with it into the purgeable list. Sets |version_id| to the
+  // id of the version that was stored and |newly_purgeable_resources| to its
+  // resources. Returns OK if it's successfully deleted or not found in the
+  // database. Otherwise, returns an error.
+  Status DeleteRegistration(int64 registration_id,
+                            const GURL& origin,
+                            int64* version_id,
+                            std::vector<int64>* newly_purgeable_resources);
 
   // As new resources are put into the diskcache, they go into an uncommitted
   // list. When a registration is saved that refers to those ids, they're