Don't prematurely delete script resources when registration is deleted

content/browser/service_worker/service_worker_registration.h

Index: content/browser/service_worker/service_worker_registration.h
diff --git a/content/browser/service_worker/service_worker_registration.h b/content/browser/service_worker/service_worker_registration.h
index df23dc3d61a55b913fa5ccd18ebc31219fe6581d..e8bce6c145cac9ed437e76bc2d5ce609ab4f2ce6 100644
--- a/content/browser/service_worker/service_worker_registration.h
+++ b/content/browser/service_worker/service_worker_registration.h
@@ -45,25 +45,25 @@ class CONTENT_EXPORT ServiceWorkerRegistration
   const GURL& pattern() const { return pattern_; }
 
   ServiceWorkerVersion* active_version() const {
-    DCHECK(!is_shutdown_);
     return active_version_.get();
   }
 
   ServiceWorkerVersion* waiting_version() const {
-    DCHECK(!is_shutdown_);
     return waiting_version_.get();
   }
 
+  bool is_uninstalling() { return is_uninstalling_; }
+
   void set_active_version(ServiceWorkerVersion* version) {
-    DCHECK(!is_shutdown_);
     active_version_ = version;
   }
 
   void set_waiting_version(ServiceWorkerVersion* version) {
-    DCHECK(!is_shutdown_);
     waiting_version_ = version;
   }
 
+  void mark_as_uninstalling() { is_uninstalling_ = true; }
+
   ServiceWorkerRegistrationInfo GetInfo();
 
   // Returns the active version, if it is not null; otherwise, returns the
@@ -85,7 +85,7 @@ class CONTENT_EXPORT ServiceWorkerRegistration
   scoped_refptr<ServiceWorkerVersion> active_version_;
   scoped_refptr<ServiceWorkerVersion> waiting_version_;
 
-  bool is_shutdown_;
+  bool is_uninstalling_;
   base::WeakPtr<ServiceWorkerContextCore> context_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerRegistration);