Address two minor FIXMEs in Push Messaging layout tests.

third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/interfaces-worker.js

Index: third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/interfaces-worker.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/interfaces-worker.js b/third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/interfaces-worker.js
index 66bfa59f4402c50e2c43f177893ee43b724405b3..a28338a31a315fe34c58e290479cec0f1556727a 100644
--- a/third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/interfaces-worker.js
+++ b/third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/interfaces-worker.js
@@ -37,9 +37,9 @@ test(function() {
 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.');