Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/transaction-coordination-within-database-expected.txt

 Check that read-only transactions within a database can run in parallel.
 
 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 = "transaction-coordination-within-database.html"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname)
 
 prepareDatabase():
 db = event.target.result
 store = db.createObjectStore('store')
 store.put('value', 'key')
 
 runParallelTransactions():
 db = event.target.result
 
 transaction1 = db.transaction('store', 'readonly')
 transaction2 = db.transaction('store', 'readonly')
 transaction1GetSuccess = false
 transaction2GetSuccess = false
 Keep both transactions alive until each has reported at least one successful operation
 
 onTransactionComplete():
 first transaction complete, still waiting...
 
 onTransactionComplete():
 PASS transaction1GetSuccess is true
 PASS transaction2GetSuccess is true
 db.close()
 PASS successfullyParsed is true
 
 TEST COMPLETE