Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/create-object-store-options-expected.txt

 Test IndexedDB's createObjectStore's various options
 
 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 = "create-object-store-options.html"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname)
 db.createObjectStore('a', {keyPath: 'a'})
 db.createObjectStore('b')
 db.createObjectStore('c', {autoIncrement: true});
 trans = db.transaction(['a', 'b'], 'readwrite')
 PASS trans.mode is "readwrite"
 trans.objectStore('a').put({'a': 0})
 Expecting TypeError exception from db.createObjectStore('d', 'bar');
 PASS Exception was thrown.
 PASS db.createObjectStore('d', 'bar'); threw TypeError: Failed to execute 'createObjectStore' on 'IDBDatabase': parameter 2 ('options') is not an object.
 Expecting TypeError exception from db.createObjectStore('e', false);
 PASS Exception was thrown.
 PASS db.createObjectStore('e', false); threw TypeError: Failed to execute 'createObjectStore' on 'IDBDatabase': parameter 2 ('options') is not an object.
 trans.objectStore('b').put({'a': 0}, 0)
 trans.objectStore('a').get(0)
 PASS event.target.result.a is {a: 0}
 trans.objectStore('b').get(0)
 PASS event.target.result.a is {a: 0}
 PASS successfullyParsed is true
 
 TEST COMPLETE