Don't prematurely delete script resources when registration is deleted

content/browser/service_worker/service_worker_database.cc

Index: content/browser/service_worker/service_worker_database.cc
diff --git a/content/browser/service_worker/service_worker_database.cc b/content/browser/service_worker/service_worker_database.cc
index 1058acc6165d6d414fbd91c3e731238093b10a80..288edd40d05bc6704eff10ec225e06584af48fdb 100644
--- a/content/browser/service_worker/service_worker_database.cc
+++ b/content/browser/service_worker/service_worker_database.cc
@@ -488,6 +488,7 @@ ServiceWorkerDatabase::Status ServiceWorkerDatabase::ReadRegistration(
 ServiceWorkerDatabase::Status ServiceWorkerDatabase::WriteRegistration(
     const RegistrationData& registration,
     const std::vector<ResourceRecord>& resources,
+    int64* deleted_version_id,
     std::vector<int64>* newly_purgeable_resources) {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
   Status status = LazyOpen(true);
@@ -529,6 +530,7 @@ ServiceWorkerDatabase::Status ServiceWorkerDatabase::WriteRegistration(
     return status;
   if (status == STATUS_OK) {
     DCHECK_LT(old_registration.version_id, registration.version_id);
+    *deleted_version_id = old_registration.version_id;
     status = DeleteResourceRecords(
         old_registration.version_id, newly_purgeable_resources, &batch);
     if (status != STATUS_OK)
@@ -598,6 +600,7 @@ ServiceWorkerDatabase::Status ServiceWorkerDatabase::UpdateLastCheckTime(
 ServiceWorkerDatabase::Status ServiceWorkerDatabase::DeleteRegistration(
     int64 registration_id,
     const GURL& origin,
+    int64* version_id,
     std::vector<int64>* newly_purgeable_resources) {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
   Status status = LazyOpen(false);
@@ -630,6 +633,7 @@ ServiceWorkerDatabase::Status ServiceWorkerDatabase::DeleteRegistration(
   for (std::vector<RegistrationData>::const_iterator itr =
            registrations.begin(); itr != registrations.end(); ++itr) {
     if (itr->registration_id == registration_id) {
+      *version_id = itr->version_id;
       status = DeleteResourceRecords(
           itr->version_id, newly_purgeable_resources, &batch);
       if (status != STATUS_OK)