Unregister with push service and SW database when permission is lost.

chrome/test/data/push_messaging/push_test.js

Index: chrome/test/data/push_messaging/push_test.js
diff --git a/chrome/test/data/push_messaging/push_test.js b/chrome/test/data/push_messaging/push_test.js
index f47003052ef7b7de6eda713b575ec7f19f03a615..be99f626758be52981619306697ee0e4d1853747 100644
--- a/chrome/test/data/push_messaging/push_test.js
+++ b/chrome/test/data/push_messaging/push_test.js
@@ -137,6 +137,15 @@ function unregister() {
   });
 }
 
+function hasRegistration() {
+  navigator.serviceWorker.ready.then(function(swRegistration) {
+    return swRegistration.pushManager.getSubscription();
+  }).then(function(subscription) {
+    sendResultToTest(subscription ? 'true - registered'
+                                  : 'false - not registered');
+  }).catch(sendErrorToTest);
+}
+
 addEventListener('message', function(event) {
   var message = JSON.parse(event.data);
   if (message.type == 'push')