ServiceWorker: Add a test to check if worker is deleted after reloading iframe following unregister

third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-then-register.html

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-then-register.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-then-register.html b/third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-then-register.html
index cec2ddc85410777c300e6c0b14e1fdf958173378..75db25c1d98e67f13f35f3c9cf353cbd5bb2bef2 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-then-register.html
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-then-register.html
@@ -57,6 +57,45 @@ async_test(function(t) {
          'registration is in use.');
 
 async_test(function(t) {
+    var scope = 'resources/scope/complete-unregistration-followed-by-' +
+                'reloading-controllee-iframe';
+    var registration;
+    var frame;
+    var service_worker;
+    service_worker_unregister_and_register(t, worker_url, scope)
+      .then(function(r) {
+          registration = r;
+          return wait_for_state(t, r.installing, 'activated');
+        })
+      .then(function() {
+          return with_iframe(scope);
+        })
+      .then(function(f) {
+          frame = f;
+          return registration.unregister();
+        })
+      .then(function() {
+          return new Promise(function(resolve) {
+              frame.onload = resolve;
+              frame.contentWindow.location.reload();
+            });
+        })
+      .then(function() {
+          var c = frame.contentWindow.navigator.serviceWorker.controller;
+          assert_equals(c, null, 'a page after unregistration should not be ' +
+                                 'controlled by service worker');
+          return navigator.serviceWorker.getRegistration(scope);
+        })
+      .then(function(r) {
+          assert_equals(r, undefined, 'getRegistration should return ' +
+                                      'undefined after unregistration');
+          service_worker_unregister_and_done(t, scope);
+        })
+      .catch(unreached_rejection(t));
+}, 'Reloading the last controlled iframe after unregistration should ensure ' +
+   'the deletion of the registration');
+
+async_test(function(t) {
     var scope = 'resources/scope/re-register-does-not-affect-existing-controllee';
     var iframe;
     var registration;