Address two minor FIXMEs in Push Messaging layout tests.

third_party/WebKit/LayoutTests/http/tests/push_messaging/interfaces.html

Index: third_party/WebKit/LayoutTests/http/tests/push_messaging/interfaces.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/push_messaging/interfaces.html b/third_party/WebKit/LayoutTests/http/tests/push_messaging/interfaces.html
index fa415a88d7900b5a2d42bcb0ac2e52f1c3e7bfcf..81a242655ffc210e9fa47b77be853373be9528a7 100644
--- a/third_party/WebKit/LayoutTests/http/tests/push_messaging/interfaces.html
+++ b/third_party/WebKit/LayoutTests/http/tests/push_messaging/interfaces.html
@@ -26,9 +26,9 @@
       test(function() {
           assert_own_property(self, 'PushSubscription', 'PushSubscription needs to be exposed as a global.');
 
-          // FIXME: Assert existence of the attributes when they are properly
-          // exposed in the prototype chain. https://crbug.com/43394
+          assert_own_property(PushSubscription.prototype, 'endpoint');
 
+          assert_own_property(PushSubscription.prototype, 'getKey');
           assert_own_property(PushSubscription.prototype, 'unsubscribe');
 
       }, 'PushSubscription should be exposed and have the expected interface in a Document.');