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

ash/screensaver/test_webview.cc

+// 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.
+
+#include "ash/screensaver/test_webview.h"
+
+#include "content/test/web_contents_tester.h"
+
+namespace ash {
+namespace test {
+
+////////////////////////////////////////////////////////////////////////////////
+// TestWebView, public:
+
+TestWebView::TestWebView(content::BrowserContext* browser_context)
+    : views::WebView(browser_context) {
+}
+
+TestWebView::~TestWebView() {
+}
+
+content::WebContents* TestWebView::CreateWebContents(
+      content::BrowserContext* browser_context,
+      content::SiteInstance* site_instance) {
+
+  return content::WebContentsTester::CreateTestWebContents(browser_context,
+                                                  site_instance);
+}
+
+}  // namespace test
+}  // namespace ash