Ensure that IDBDatabase objects are deleted when there are no retaining paths left

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

dbname = "delete-closed-database-object.html"
indexedDB.deleteDatabase(dbname)
indexedDB.open(dbname)
db.close()
indexedDB.open(dbname)
Dropping references to new connection.
Open request should not receive a blocked event:
indexedDB.open(dbname, 2)
PASS successfullyParsed is true

TEST COMPLETE