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

ui/views/test/test_views_delegate.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/test_views_delegate.h"
 
 #include "base/logging.h"
+#include "content/test/web_contents_tester.h"
 #include "ui/base/clipboard/clipboard.h"
 
 namespace views {
 
 TestViewsDelegate::TestViewsDelegate()
     : use_transparent_windows_(false) {
   DCHECK(!ViewsDelegate::views_delegate);
   ViewsDelegate::views_delegate = this;
 }
 
@@ skipping 39 matching lines @@
   return 0;
 }
 
 #if defined(USE_AURA)
 views::NativeWidgetHelperAura* TestViewsDelegate::CreateNativeWidgetHelper(
     views::NativeWidgetAura* native_widget) {
   return NULL;
 }
 #endif
 
+content::WebContents* TestViewsDelegate::CreateWebContents(
+    content::BrowserContext* browser_context,
+    content::SiteInstance* site_instance) {
+  return content::WebContentsTester::CreateTestWebContents(browser_context,
+                                                           site_instance);
+}
+
 }  // namespace views