cros: Cleanup lock screen and OOBE C++ backing code.

chrome/browser/chromeos/login/lock/screen_locker_delegate.cc

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/chromeos/login/lock/screen_locker.h"
-#include "chrome/browser/chromeos/login/lock/screen_locker_delegate.h"
-
-namespace chromeos {
-
-ScreenLockerDelegate::ScreenLockerDelegate(ScreenLocker* screen_locker)
-    : screen_locker_(screen_locker) {
-}
-
-ScreenLockerDelegate::~ScreenLockerDelegate() {
-}
-
-void ScreenLockerDelegate::ScreenLockReady() {
-  screen_locker_->ScreenLockReady();
-}
-
-content::WebUI* ScreenLockerDelegate::GetAssociatedWebUI() {
-  return NULL;
-}
-
-}  // namespace chromeos