[ServiceWorkr] Add NULL check of provider_host_ in ServiceWorkerControlleeRequestHandler's callbacks

content/browser/service_worker/service_worker_controllee_request_handler.cc

Index: content/browser/service_worker/service_worker_controllee_request_handler.cc
diff --git a/content/browser/service_worker/service_worker_controllee_request_handler.cc b/content/browser/service_worker/service_worker_controllee_request_handler.cc
index 382ece5ebd2700d02cadf5e26453b266c440eb69..0c21cf4312d27bc8a796a259719808ae8c7cfeb4 100644
--- a/content/browser/service_worker/service_worker_controllee_request_handler.cc
+++ b/content/browser/service_worker/service_worker_controllee_request_handler.cc
@@ -136,7 +136,8 @@ ServiceWorkerControlleeRequestHandler::DidLookupRegistrationForMainResource(
     ServiceWorkerStatusCode status,
     const scoped_refptr<ServiceWorkerRegistration>& registration) {
   DCHECK(job_.get());
-  provider_host_->SetAllowAssociation(true);
+  if (provider_host_)
+    provider_host_->SetAllowAssociation(true);
   if (status != SERVICE_WORKER_OK) {
     job_->FallbackToNetwork();
     TRACE_EVENT_ASYNC_END1(
@@ -161,7 +162,8 @@ ServiceWorkerControlleeRequestHandler::DidLookupRegistrationForMainResource(
   // Wait until it's activated before firing fetch events.
   if (active_version.get() &&
       active_version->status() == ServiceWorkerVersion::ACTIVATING) {
-    provider_host_->SetAllowAssociation(false);
+    if (provider_host_)
+      provider_host_->SetAllowAssociation(false);
     registration->active_version()->RegisterStatusChangeCallback(
         base::Bind(&self::OnVersionStatusChanged,
                    weak_factory_.GetWeakPtr(),
@@ -191,7 +193,8 @@ ServiceWorkerControlleeRequestHandler::DidLookupRegistrationForMainResource(
 
   ServiceWorkerMetrics::CountControlledPageLoad();
 
-  provider_host_->AssociateRegistration(registration.get());
+  if (provider_host_)
+    provider_host_->AssociateRegistration(registration.get());
   job_->ForwardToServiceWorker();
   TRACE_EVENT_ASYNC_END2(
       "ServiceWorker",
@@ -205,7 +208,8 @@ ServiceWorkerControlleeRequestHandler::DidLookupRegistrationForMainResource(
 void ServiceWorkerControlleeRequestHandler::OnVersionStatusChanged(
     ServiceWorkerRegistration* registration,
     ServiceWorkerVersion* version) {
-  provider_host_->SetAllowAssociation(true);
+  if (provider_host_)
+    provider_host_->SetAllowAssociation(true);
   if (version != registration->active_version() ||
       version->status() != ServiceWorkerVersion::ACTIVATED) {
     job_->FallbackToNetwork();
@@ -214,7 +218,8 @@ void ServiceWorkerControlleeRequestHandler::OnVersionStatusChanged(
 
   ServiceWorkerMetrics::CountControlledPageLoad();
 
-  provider_host_->AssociateRegistration(registration);
+  if (provider_host_)
+    provider_host_->AssociateRegistration(registration);
   job_->ForwardToServiceWorker();
 }