Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/intversion-open-with-version-expected.txt

 Test that specifying a version when opening a non-existent db causes an upgradeneeded event and that the version number is set correctly.
 
 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-open-with-version.html"
 indexedDB.deleteDatabase(dbname)
 Should trigger:
 4.1.4: If no database with the given name from the origin origin was found, or if it was deleted during the previous step, then create a database with name name, with 0 as version, and with no object stores. Let db be the new database.
 4.1.6: Create a new connection to db and let connection represent it.
 4.1.7: If the version of db is lower than version, then run the steps for running a "versionchange" transaction using connection, version, request and upgrade callback.
 4.1.9: Return connection.
 request = indexedDB.open(dbname, 7)
 PASS String(request) is "[object IDBOpenDBRequest]"
 
@@ skipping 19 matching lines @@
 PASS sawUpgradeNeeded is true
 PASS sawTransactionComplete is true
 db = event.target.result
 Kind of test 4.1.9:
 PASS String(db) is "[object IDBDatabase]"
 PASS db.version is 7
 PASS successfullyParsed is true
 
 TEST COMPLETE