Fix crash during EmbeddedWorkerInstance startup sequence failures

content/browser/service_worker/embedded_worker_instance.h

Index: content/browser/service_worker/embedded_worker_instance.h
diff --git a/content/browser/service_worker/embedded_worker_instance.h b/content/browser/service_worker/embedded_worker_instance.h
index 7bece691cd392a4ebf2b5129611e9a6db8f55a70..418c2935427c8d19370d0d48f2c224f78eda9be1 100644
--- a/content/browser/service_worker/embedded_worker_instance.h
+++ b/content/browser/service_worker/embedded_worker_instance.h
@@ -153,6 +153,7 @@ class CONTENT_EXPORT EmbeddedWorkerInstance {
   FRIEND_TEST_ALL_PREFIXES(EmbeddedWorkerInstanceTest, StartAndStop);
   FRIEND_TEST_ALL_PREFIXES(EmbeddedWorkerInstanceTest, DetachDuringStart);
   FRIEND_TEST_ALL_PREFIXES(EmbeddedWorkerInstanceTest, StopDuringStart);
+  FRIEND_TEST_ALL_PREFIXES(EmbeddedWorkerInstanceTest, DestroyDuringStart);
 
   // Constructor is called via EmbeddedWorkerRegistry::CreateWorker().
   // This instance holds a ref of |registry|.
@@ -232,6 +233,8 @@ class CONTENT_EXPORT EmbeddedWorkerInstance {
                               const GURL& source_url);
 
   void ReleaseProcess();
+  void OnStartFailed(ServiceWorkerStatusCode status,
+                     const StatusCallback& callback);
 
   base::WeakPtr<ServiceWorkerContextCore> context_;
   scoped_refptr<EmbeddedWorkerRegistry> registry_;