Service Worker: Improve error messages from register().

content/browser/service_worker/service_worker_write_to_cache_job.h

Index: content/browser/service_worker/service_worker_write_to_cache_job.h
diff --git a/content/browser/service_worker/service_worker_write_to_cache_job.h b/content/browser/service_worker/service_worker_write_to_cache_job.h
index ec3bfa7464be74176ffadaa9c1622f5b9aa8cf14..95746d99ca74c461e9415d1c74365419b50e5972 100644
--- a/content/browser/service_worker/service_worker_write_to_cache_job.h
+++ b/content/browser/service_worker/service_worker_write_to_cache_job.h
@@ -93,7 +93,8 @@ class CONTENT_EXPORT ServiceWorkerWriteToCacheJob
   void OnResponseStarted(net::URLRequest* request) override;
   void OnReadCompleted(net::URLRequest* request, int bytes_read) override;
 
-  void AsyncNotifyDoneHelper(const net::URLRequestStatus& status);
+  void AsyncNotifyDoneHelper(const net::URLRequestStatus& status,
+                             const std::string& status_message);
 
   ResourceType resource_type_;  // Differentiate main script and imports
   scoped_refptr<net::IOBuffer> io_buffer_;