Bug 1577085 [wpt PR 18716] - Update interfaces/IndexedDB.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/IndexedDB.idl (#18716)

Source: https://github.com/tidoust/reffy-reports/blob/3eeb4d0/whatwg/idl/IndexedDB.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/577694005
--

wpt-commits: 772c8e3eded299d8a098ddac8b0ef42e7e24161e
wpt-pr: 18716

testing/web-platform/tests/interfaces/IndexedDB.idl

@@ -29,7 +29,7 @@ interface IDBOpenDBRequest : IDBRequest {
 };
 
 [Exposed=(Window,Worker),
- Constructor(DOMString type, optional IDBVersionChangeEventInit eventInitDict)]
+ Constructor(DOMString type, optional IDBVersionChangeEventInit eventInitDict = {})]
 interface IDBVersionChangeEvent : Event {
   readonly attribute unsigned long long oldVersion;
   readonly attribute unsigned long long? newVersion;
@@ -70,8 +70,9 @@ interface IDBDatabase : EventTarget {
                                          optional IDBTransactionMode mode = "readonly");
   void close();
 
-  [NewObject] IDBObjectStore createObjectStore(DOMString name,
-                                               optional IDBObjectStoreParameters options);
+  [NewObject] IDBObjectStore createObjectStore(
+    DOMString name,
+    optional IDBObjectStoreParameters options = {});
   void deleteObjectStore(DOMString name);
 
   // Event handlers:
@@ -115,7 +116,7 @@ interface IDBObjectStore {
 
   [NewObject] IDBIndex createIndex(DOMString name,
                                    (DOMString or sequence<DOMString>) keyPath,
-                                   optional IDBIndexParameters options);
+                                   optional IDBIndexParameters options = {});
   void deleteIndex(DOMString name);
 };