Handle push resubscribes with no sender info (avoids DCHECK)

chrome/test/data/push_messaging/service_worker.js

Index: chrome/test/data/push_messaging/service_worker.js
diff --git a/chrome/test/data/push_messaging/service_worker.js b/chrome/test/data/push_messaging/service_worker.js
index f32068849a8fb2b3995e84fd895d82133efc97a0..5cc3db846dbc1ca079ddcc74aaf8b5fddcc52b41 100644
--- a/chrome/test/data/push_messaging/service_worker.js
+++ b/chrome/test/data/push_messaging/service_worker.js
@@ -49,6 +49,9 @@ this.onpush = function(event) {
 self.addEventListener('message', function handler (event) {
   if (event.data.command == 'workerSubscribe') {
     pushSubscriptionOptions.applicationServerKey = kApplicationServerKey.buffer;
+  } else if (event.data.command == 'workerSubscribeWithNumericKey') {
+    pushSubscriptionOptions.applicationServerKey =
+        new TextEncoder().encode('1234567890');
   } else if (event.data.command == 'workerSubscribeNoKey') {
     // Nothing to set up
   } else {