Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/mozilla/readyState-expected.txt

 Test IndexedDB readyState property during different operations
 
 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 = "readyState.html"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname)
 PASS openRequest.readyState is 'done'
 objectStore = db.createObjectStore('foo');
 key = 10;
 request = objectStore.add({}, key);
 PASS request.readyState is 'pending'
 getRecord():
 PASS request.readyState is 'done'
 PASS event.target.result is key
 request = objectStore.get(key);
 PASS request.readyState is 'pending'
 finalCheck():
 PASS request.readyState is 'done'
 PASS event.target.result == null is false
 checkReadyStateInOpen():
 PASS event.target is openRequest
 PASS openRequest.readyState is "done"
 PASS successfullyParsed is true
 
 TEST COMPLETE