Implement updateViaCache flag and no-cache by default for main service worker scripts

content/common/service_worker/service_worker_types.cc

Index: content/common/service_worker/service_worker_types.cc
diff --git a/content/common/service_worker/service_worker_types.cc b/content/common/service_worker/service_worker_types.cc
index f483200bf94e55f49ba3fe865f8e9caf2cd0bc79..c14454f6c99c526b1146df348a0b3407cace701b 100644
--- a/content/common/service_worker/service_worker_types.cc
+++ b/content/common/service_worker/service_worker_types.cc
@@ -137,8 +137,8 @@ bool ServiceWorkerObjectInfo::IsValid() const {
 
 ServiceWorkerRegistrationObjectInfo::ServiceWorkerRegistrationObjectInfo()
     : handle_id(kInvalidServiceWorkerRegistrationHandleId),
-      registration_id(kInvalidServiceWorkerRegistrationId) {
-}
+      use_cache(false),
+      registration_id(kInvalidServiceWorkerRegistrationId) {}
 
 ServiceWorkerClientQueryOptions::ServiceWorkerClientQueryOptions()
     : client_type(blink::WebServiceWorkerClientTypeWindow),