Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/closed-cursor-expected.txt

 Verify that that cursors accessed after being closed are well behaved
 
 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 = "closed-cursor.html"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname)
 
 prepareDatabase():
 db = event.target.result
 store = db.createObjectStore('store')
 store.put({value: 'value'}, ['key'])
 
 onOpen():
 db = event.target.result
 tx = db.transaction('store')
 store = tx.objectStore('store')
 cursorRequest = store.openCursor()
 
 openCursorSuccess():
 cursor = cursorRequest.result
 Don't continue the cursor, so it retains its key/primaryKey/value
 
 transactionComplete():
 PASS JSON.stringify(cursor.key) is "[\"key\"]"
 PASS JSON.stringify(cursor.primaryKey) is "[\"key\"]"
 PASS JSON.stringify(cursor.value) is "{\"value\":\"value\"}"
 PASS successfullyParsed is true
 
 TEST COMPLETE