Re-implement the screensaver to use WebView instead of ExtensionDialogHost.

chrome/browser/chromeos/ui/screensaver_extension_dialog.h

-// Copyright (c) 2012 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_UI_SCREENSAVER_EXTENSION_DIALOG_H_
-#define CHROME_BROWSER_CHROMEOS_UI_SCREENSAVER_EXTENSION_DIALOG_H_
-#pragma once
-
-#include "base/memory/ref_counted.h"
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/ui/views/extensions/extension_dialog_observer.h"
-
-class Extension;
-class ExtensionDialog;
-
-namespace browser {
-
-void ShowScreensaverDialog(scoped_refptr<Extension> extension);
-void CloseScreensaverDialog();
-
-}  // namespace browser
-
-// Shows or hides the screensaver extension in fullscreen mode on
-// top of all other windows.
-class ScreensaverExtensionDialog : public ExtensionDialogObserver {
- public:
-  static void ShowScreensaverDialog(scoped_refptr<Extension> extension);
-  static void CloseScreensaverDialog();
-
-  // ExtensionDialog::Observer implementation.
-  virtual void ExtensionDialogClosing(ExtensionDialog* dialog) OVERRIDE;
-  virtual void ExtensionTerminated(ExtensionDialog* dialog) OVERRIDE;
-
- protected:
-  virtual void Show();
-  virtual void Close();
-
- private:
-  friend class ScreensaverExtensionDialogBrowserTest;
-  friend class ScreensaverExtensionDialogTest;
-
-  explicit ScreensaverExtensionDialog(scoped_refptr<Extension> extension);
-  virtual ~ScreensaverExtensionDialog();
-
-  // Reload the screensaver extension and show another screensaver dialog.
-  void ReloadAndShow();
-
-  scoped_refptr<Extension> screensaver_extension_;
-  // Host for the extension that implements this dialog.
-  scoped_refptr<ExtensionDialog> extension_dialog_;
-
-  // Set while we're loading an extension; only touched from the UI thread.
-  bool loading_extension_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScreensaverExtensionDialog);
-};
-
-#endif  // CHROME_BROWSER_CHROMEOS_UI_SCREENSAVER_EXTENSION_DIALOG_H_