cros: Only preload the lock screen; do not reuse it.

chrome/browser/chromeos/login/ui/web_view_handle.h

-// Copyright 2016 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEB_VIEW_HANDLE_H_
-#define CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEB_VIEW_HANDLE_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-
-class Profile;
-
-namespace views {
-class WebView;
-}
-
-namespace chromeos {
-
-// Owns a views::WebView instance. Any caller actively using the views::WebView
-// instance should increase/decrease the refcount.
-class WebViewHandle : public base::RefCounted<WebViewHandle> {
- public:
-  explicit WebViewHandle(Profile* profile);
-
-  // Returns an unowned pointer to the stored |web_view| instance.
-  views::WebView* web_view() { return web_view_.get(); }
-
- private:
-  friend class base::RefCounted<WebViewHandle>;
-  ~WebViewHandle();
-
-  std::unique_ptr<views::WebView> web_view_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebViewHandle);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEB_VIEW_HANDLE_H_