[IndexedDB] Convert remaining methods to "algorithmic style" (#5)

- [ ] IDBFactory#open
- [ ] IDBFactory#deleteDatabase
- [ ] IDBDatabase#createObjectStore
- [ ] IDBDatabase#deleteObjectStore
- [ ] IDBDatabase#transaction
- [ ] IDBDatabase#close
- [ ] IDBObjectStore#createIndex
- [ ] IDBObjectStore#deleteIndex
- [ ] IDBObjectStore#index
- [ ] IDBTransaction#abort
- [ ] IDBTransaction#objectStore





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https://github.com/w3c/IndexedDB/issues/5