Address two minor FIXMEs in Push Messaging layout tests.

BUG=

Review URL: https://codereview.chromium.org/1469813004

Cr-Commit-Position: refs/heads/master@{#361100}

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.');

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.');