Mark DOMStringList.contains() as deprecated, add console warning.

LayoutTests/storage/indexeddb/resources/database-basics.js

 if (this.importScripts) {
     importScripts('../../../resources/js-test.js');
     importScripts('shared.js');
 }
 
 description("Test the basics of IndexedDB's IDBDatabase.");
 
 indexedDBTest(prepareDatabase, testSetVersionAbort);
 function prepareDatabase()
 {
     db = event.target.result;
     debug("Test that you can't open a transaction while in a versionchange transaction");
     evalAndExpectException('db.transaction("doesntExist")',
                            "DOMException.INVALID_STATE_ERR", "'InvalidStateError'");
 
     shouldBe("db.version", "1");
     shouldBeEqualToString("db.name", dbname);
     shouldBe("db.objectStoreNames", "[]");
     shouldBe("db.objectStoreNames.length", "0");
     shouldBe("db.objectStoreNames.contains('')", "false");
     shouldBeUndefined("db.objectStoreNames[0]");
-    shouldBeNull("db.objectStoreNames.item(0)");
 
     objectStore = evalAndLog('db.createObjectStore("test123")');
     checkObjectStore();
 }
 
 function checkObjectStore()
 {
     shouldBe("db.objectStoreNames", "['test123']");
     shouldBe("db.objectStoreNames.length", "1");
     shouldBe("db.objectStoreNames.contains('')", "false");
@@ skipping 35 matching lines @@
 
 function testClose()
 {
     evalAndLog("db.close()");
     debug("Now that the connection is closed, transaction creation should fail");
     evalAndExpectException("db.transaction('test123')", "DOMException.INVALID_STATE_ERR", "'InvalidStateError'");
     debug("Call twice, make sure it's harmless");
     evalAndLog("db.close()");
     finishJSTest();
 }