ServiceWorker: Remove iframes explicitly after a test is finished

third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-controller.html

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-controller.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-controller.html b/third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-controller.html
index fc05f7763f5914fe733b6a04dead432d58a374ff..c43dc0b6c04d4bb68ebed6c4088a55792b7e4c3c 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-controller.html
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/unregister-controller.html
@@ -18,7 +18,7 @@ async_test(function(t) {
           return wait_for_state(t, r.installing, 'activated');
         })
       .then(function() {
-          return with_iframe(scope);
+          return with_iframe(scope, true);
         })
       .then(function(frame) {
           frame_window = frame.contentWindow;
@@ -55,7 +55,7 @@ async_test(function(t) {
           return registration.unregister();
         })
       .then(function() {
-          return with_iframe(scope);
+          return with_iframe(scope, true);
         })
       .then(function(frame) {
           var frame_window = frame.contentWindow;
@@ -82,13 +82,13 @@ async_test(function(t) {
           return wait_for_state(t, r.installing, 'activated');
         })
       .then(function() {
-          return with_iframe(scope);
+          return with_iframe(scope, true);
         })
       .then(function(frame) {
           return registration.unregister();
         })
       .then(function() {
-          return with_iframe(scope);
+          return with_iframe(scope, true);
         })
       .then(function(frame) {
           assert_equals(frame.contentWindow.navigator.serviceWorker.controller,