Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/blob-delete-objectstore-db-expected.txt

 Test that deleting an object store and a database containing blobs doesn't crash.
 
 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 = "blob-delete-objectstore-db.html"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname, 1)
 store0 = db.createObjectStore('store0')
 store1 = db.createObjectStore('store1')
 store0.put(blobA, key)
 db.close()
 
 reopen():
 request = indexedDB.open(dbname, 2)
 
 deleteObjectStore():
 db.deleteObjectStore('store0')
 
 didDeleteObjectStore():
 trans = db.transaction('store1', 'readwrite')
 store1 = trans.objectStore('store1')
 store1.put(blobB, key)
 db.close()
 request = indexedDB.deleteDatabase(dbname)
 Database deleted.
 PASS successfullyParsed is true
 
 TEST COMPLETE