ServiceWorker: some more groundwork in support of the update process

content/browser/service_worker/service_worker_version.h

Index: content/browser/service_worker/service_worker_version.h
diff --git a/content/browser/service_worker/service_worker_version.h b/content/browser/service_worker/service_worker_version.h
index f2fa3417bac485e7790f8186440591e7479e108b..060e36d8bdc977ca918f4ad207c15ee4f5348d04 100644
--- a/content/browser/service_worker/service_worker_version.h
+++ b/content/browser/service_worker/service_worker_version.h
@@ -38,10 +38,6 @@ class ServiceWorkerVersionInfo;
 // more than one ServiceWorkerVersion "running" at a time, but only
 // one of them is active. This class connects the actual script with a
 // running worker.
-//
-// is_shutdown_ detects the live-ness of the object itself. If the object is
-// shut down, then it is in the process of being deleted from memory.
-// This happens when a version is replaced as well as at browser shutdown.
 class CONTENT_EXPORT ServiceWorkerVersion
     : NON_EXPORTED_BASE(public base::RefCounted<ServiceWorkerVersion>),
       public EmbeddedWorkerInstance::Listener {