Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/transaction-coordination-ro-waits-for-rw-expected.txt

 readonly transaction should see the result of a previous readwrite transaction
 
 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-ro-waits-for-rw.html"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname)
 
 prepareDatabase():
 db = event.target.result
 store = db.createObjectStore('store')
 store.put('original value', 'key')
 
 runTransactions():
 db = event.target.result
 transaction1 = db.transaction('store', 'readwrite')
 transaction2 = db.transaction('store', 'readonly')
 request = transaction1.objectStore('store').put('new value', 'key')
 request2 = transaction2.objectStore('store').get('key')
 
 checkResult():
 PASS request2.result is "new value"
 PASS successfullyParsed is true
 
 TEST COMPLETE