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

ui/views/controls/webview/webview.h

Index: ui/views/controls/webview/webview.h
diff --git a/ui/views/controls/webview/webview.h b/ui/views/controls/webview/webview.h
index 5a73dc967f1677fb904ec300f24f9d8604c3a3f6..de6fa7c418ef69cd730bb04911117dc1c70f5315 100644
--- a/ui/views/controls/webview/webview.h
+++ b/ui/views/controls/webview/webview.h
@@ -102,6 +102,13 @@ class VIEWS_EXPORT WebView : public View,
                              content::RenderViewHost* new_host);
   void WebContentsDestroyed(content::WebContents* web_contents);
 
+  // Create a regular or test web contents (based on whether we're running
+  // in a unit test or not).
+  content::WebContents* CreateWebContents(
+      content::BrowserContext* browser_context,
+      content::SiteInstance* site_instance);
+
+
   NativeViewHost* wcv_holder_;
   scoped_ptr<content::WebContents> wc_owner_;
   content::WebContents* web_contents_;
@@ -114,4 +121,4 @@ class VIEWS_EXPORT WebView : public View,
 
 }  // namespace views
 
-#endif  // UI_VIEWS_CONTROLS_WEBVIEW_WEBVIEW_H_
+#endif  // UI_VIEWS_CONTROLS_WEBVIEW_WEBVIEW_H_