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

content/browser/service_worker/service_worker_registration.cc

Index: content/browser/service_worker/service_worker_registration.cc
diff --git a/content/browser/service_worker/service_worker_registration.cc b/content/browser/service_worker/service_worker_registration.cc
index c99efc89ceb7d5c4c03087c75bf6106c1bad0a67..f1964ff08a3099a91e9918dda79fe06da076c257 100644
--- a/content/browser/service_worker/service_worker_registration.cc
+++ b/content/browser/service_worker/service_worker_registration.cc
@@ -32,6 +32,7 @@ ServiceWorkerRegistration::ServiceWorkerRegistration(
       is_uninstalling_(false),
       is_uninstalled_(false),
       should_activate_when_ready_(false),
+      resources_total_size_bytes_(0),
       context_(context) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(context_);