ServiceWorker: Confirm the liveness of the associated context before handling message

content/browser/service_worker/service_worker_register_job.cc

Index: content/browser/service_worker/service_worker_register_job.cc
diff --git a/content/browser/service_worker/service_worker_register_job.cc b/content/browser/service_worker/service_worker_register_job.cc
index dca493fb858277d1e7eb511a69236154601372b9..abf33921c762e29de163e286310372ad1d3f0784 100644
--- a/content/browser/service_worker/service_worker_register_job.cc
+++ b/content/browser/service_worker/service_worker_register_job.cc
@@ -9,6 +9,7 @@
 #include "base/message_loop/message_loop.h"
 #include "content/browser/service_worker/service_worker_context_core.h"
 #include "content/browser/service_worker/service_worker_job_coordinator.h"
+#include "content/browser/service_worker/service_worker_provider_host_registry.h"
 #include "content/browser/service_worker/service_worker_registration.h"
 #include "content/browser/service_worker/service_worker_storage.h"
 #include "content/browser/service_worker/service_worker_utils.h"
@@ -410,8 +411,8 @@ void ServiceWorkerRegisterJob::AssociateWaitingVersionToDocuments(
   // TODO(michaeln): This needs to respect the longest prefix wins
   // when it comes to finding a registration for a document url.
   // This should utilize storage->FindRegistrationForDocument().
-  for (scoped_ptr<ServiceWorkerContextCore::ProviderHostIterator> it =
-           context->GetProviderHostIterator();
+  for (scoped_ptr<ServiceWorkerProviderHostRegistry::Iterator> it =
+           context->provider_registry()->GetProviderHostIterator();
        !it->IsAtEnd();
        it->Advance()) {
     ServiceWorkerProviderHost* host = it->GetProviderHost();
@@ -427,8 +428,8 @@ void ServiceWorkerRegisterJob::DisassociateWaitingVersionFromDocuments(
     base::WeakPtr<ServiceWorkerContextCore> context,
     int64 version_id) {
   DCHECK(context);
-  for (scoped_ptr<ServiceWorkerContextCore::ProviderHostIterator> it =
-           context->GetProviderHostIterator();
+  for (scoped_ptr<ServiceWorkerProviderHostRegistry::Iterator> it =
+           context->provider_registry()->GetProviderHostIterator();
        !it->IsAtEnd();
        it->Advance()) {
     ServiceWorkerProviderHost* host = it->GetProviderHost();