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

ui/views/test/webview_test_helper.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 "ui/views/test/webview_test_helper.h"
+
+#include "base/message_loop.h"
+#include "content/test/mock_render_process_host.h"
+#include "content/test/test_browser_thread.h"
+#include "content/test/test_content_client_initializer.h"
+#include "content/test/test_render_view_host_factory.h"
+#include "ui/views/controls/webview/webview.h"
+
+namespace views {
+
+WebViewTestHelper::WebViewTestHelper(MessageLoopForUI* ui_loop) {
+  test_content_client_initializer_.reset(
+      new content::TestContentClientInitializer);
+
+  // Setup to register a new RenderViewHost factory which manufactures
+  // mock render process hosts. This ensures that we never create a 'real'
+  // render view host since support for it doesn't exist in unit tests.
+  rph_factory_.reset(new content::MockRenderProcessHostFactory());
+  rvh_factory_.reset(
+      new content::TestRenderViewHostFactory(rph_factory_.get()));
+
+  ui_thread_.reset(
+      new content::TestBrowserThread(content::BrowserThread::UI, ui_loop));
+}
+
+WebViewTestHelper::~WebViewTestHelper() {
+}
+
+}  // namespace views