DCHECK fix: don't call a given callback twice in ServiceWorkerContextCore

content/browser/service_worker/service_worker_context_core.cc

Index: content/browser/service_worker/service_worker_context_core.cc
diff --git a/content/browser/service_worker/service_worker_context_core.cc b/content/browser/service_worker/service_worker_context_core.cc
index c1eab540442c37eea3aa6e4859ad94646ab4509f..5346f92f15a53c87be66eba6b32b8106a18a27c4 100644
--- a/content/browser/service_worker/service_worker_context_core.cc
+++ b/content/browser/service_worker/service_worker_context_core.cc
@@ -93,6 +93,7 @@ void ServiceWorkerContextCore::RegistrationComplete(
   if (status != SERVICE_WORKER_OK) {
     DCHECK(!registration);
     callback.Run(status, -1L);
+    return;
   }
 
   callback.Run(status, registration->id());