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

ash/screensaver/test_webview.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 ASH_SCREENSAVER_TEST_WEBVIEW_H_
+#define ASH_SCREENSAVER_TEST_WEBVIEW_H_
+#pragma once
+
+#include "ui/views/controls/webview/webview.h"
+
+namespace ash {
+namespace test {
+
+class VIEWS_EXPORT TestWebView : public views::WebView {
+ public:
+  explicit TestWebView(content::BrowserContext* browser_context);
+  virtual ~TestWebView();
+
+  // Creates a TestWebContents.
+  virtual content::WebContents* CreateWebContents(
+      content::BrowserContext* browser_context,
+      content::SiteInstance* site_instance) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestWebView);
+};
+
+}  // namespace test
+}  // namespace ash
+
+#endif  // ASH_SCREENSAVER_TEST_WEBVIEW_H_