Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/intversion-abort-in-initial-upgradeneeded-expected.txt

 Test that an abort in the initial upgradeneeded sets version back to 0
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-indexedDB = self.indexedDB || self.webkitIndexedDB || self.mozIndexedDB || self.msIndexedDB || self.OIndexedDB;
-
 dbname = "intversion-abort-in-initial-upgradeneeded.html"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname, 2)
 request.onupgradeneeded = upgradeNeeded
 request.onerror = onError
 
 upgradeNeeded():
 PASS db.version is 2
 transaction.abort()
 
 onAbort():
 PASS event.target.db.version is 0
 PASS request.transaction is non-null.
 
 onError():
 PASS request is event.target
 PASS event.target.result is undefined.
 PASS event.target.error is non-null.
 PASS event.target.error.name is "AbortError"
 PASS request.transaction is null
 PASS successfullyParsed is true
 
 TEST COMPLETE