[ServiceWorker] Added size deltas and total size computation for QuotaM.

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 59b27648155b2298d6ba4fc8cd73a4f8834602bd..d8dbd07b4a822f4b1ba7ea268609c34e6e3bb1c7 100644
--- a/content/browser/service_worker/service_worker_database.h
+++ b/content/browser/service_worker/service_worker_database.h
@@ -123,15 +123,15 @@ class CONTENT_EXPORT ServiceWorkerDatabase {
   // Writes |registration| and |resources| into the database and does following
   // things:
   //   - If an old version of the registration exists, deletes it and sets
-  //   |deleted_version_id| to the old version id and
+  //   |deleted_version| to the old version registration data object
   //   |newly_purgeable_resources| to its resources. Otherwise, sets
-  //   |deleted_version_id| to -1.
+  //   |deleted_version->version_id| to -1.
   //   - Bumps the next registration id and the next version id if needed.
   //   - Removes |resources| from the uncommitted list if exist.
   // Returns OK they are successfully written. Otherwise, returns an error.
   Status WriteRegistration(const RegistrationData& registration,
                            const std::vector<ResourceRecord>& resources,
-                           int64* deleted_version_id,
+                           RegistrationData* deleted_version,
                            std::vector<int64>* newly_purgeable_resources);
 
   // Updates a registration for |registration_id| to an active state. Returns OK