Sync Cache API tests w/ web-platform-tests

third_party/WebKit/LayoutTests/http/tests/cachestorage/resources/iframe.html

Index: third_party/WebKit/LayoutTests/http/tests/cachestorage/resources/iframe.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/cachestorage/resources/iframe.html b/third_party/WebKit/LayoutTests/http/tests/cachestorage/resources/iframe.html
index f4f418b8ddb44e1a95afe126a9023b31b79592bd..a2f1e502bb392bbdf443b7de86e730a8e6085af8 100644
--- a/third_party/WebKit/LayoutTests/http/tests/cachestorage/resources/iframe.html
+++ b/third_party/WebKit/LayoutTests/http/tests/cachestorage/resources/iframe.html
@@ -4,10 +4,15 @@
 window.onmessage = function(e) {
     var id = e.data.id;
     try {
-        self.caches;
-        window.parent.postMessage({id: id, result: 'allowed'}, '*');
+        var name = 'checkallowed';
+        self.caches.open(name).then(function (cache) {
+            self.caches.delete(name);
+            window.parent.postMessage({id: id, result: 'allowed'}, '*');
+        }).catch(function(e) {
+            window.parent.postMessage({id: id, result: 'denied', name: e.name, message: e.message}, '*');
+        });
     } catch (e) {
-        window.parent.postMessage({id: id, result: 'denied', name: e.name, message: e.message}, '*');
+        window.parent.postMessage({id: id, result: 'unexpecteddenied', name: e.name, message: e.message}, '*');
     }
 };
 </script>