ServiceWorker: Let dtor of SWRegistration work in the shutdown sequence

content/browser/service_worker/service_worker_registration.cc

Index: content/browser/service_worker/service_worker_registration.cc
diff --git a/content/browser/service_worker/service_worker_registration.cc b/content/browser/service_worker/service_worker_registration.cc
index aed07474996b3601dcb782ba9e479adbf713c70c..caad32061aa670b56494bf20d4a41ca4f3a7a1db 100644
--- a/content/browser/service_worker/service_worker_registration.cc
+++ b/content/browser/service_worker/service_worker_registration.cc
@@ -49,11 +49,6 @@ ServiceWorkerRegistration::ServiceWorkerRegistration(
 }
 
 ServiceWorkerRegistration::~ServiceWorkerRegistration() {
-  // Can be false during shutdown, in which case the DCHECK_CURRENTLY_ON below
-  // would cry.
-  if (!BrowserThread::IsThreadInitialized(BrowserThread::IO))
-    return;
-
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(!listeners_.might_have_observers());
   if (context_)