ServiceWorker: Spec alignment tweaks for Request/Response objects

Source/modules/serviceworkers/ResponseInit.h

Index: Source/modules/serviceworkers/ResponseInit.h
diff --git a/Source/modules/serviceworkers/ResponseInit.h b/Source/modules/serviceworkers/ResponseInit.h
index 93c4db82fca82b9dcc53afc69b85b0c09c95b7e7..b82154ed288780db06a0f9bd41178813b6ee4149 100644
--- a/Source/modules/serviceworkers/ResponseInit.h
+++ b/Source/modules/serviceworkers/ResponseInit.h
@@ -17,6 +17,7 @@ struct ResponseInit {
         , statusText("OK")
     {
         options.get("status", status);
+        // FIXME: Spec uses ByteString for statusText. http://crbug.com/347426
         options.get("statusText", statusText);
         options.get("headers", headers);
     }