Set the fetch API request flags correctly for navigation requests.

LayoutTests/http/tests/serviceworker/resources/request-end-to-end-worker.js

Index: LayoutTests/http/tests/serviceworker/resources/request-end-to-end-worker.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/request-end-to-end-worker.js b/LayoutTests/http/tests/serviceworker/resources/request-end-to-end-worker.js
index f58036c2cd29433168b10fcbb98f0a4cc79a07f4..2cd7eb1778af31182bc4e00dcd57a503a103cf9c 100644
--- a/LayoutTests/http/tests/serviceworker/resources/request-end-to-end-worker.js
+++ b/LayoutTests/http/tests/serviceworker/resources/request-end-to-end-worker.js
@@ -16,6 +16,9 @@ onfetch = function(e) {
     method: e.request.method,
     referrer: e.request.referrer,
     headers: headers,
+    mode: e.request.mode,
+    credentials: e.request.credentials,
+    redirect: e.request.redirect,
     append_header_error: append_header_error
   })));
 };