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

chrome/browser/ui/views/ash/chrome_shell_delegate.cc

Index: chrome/browser/ui/views/ash/chrome_shell_delegate.cc
diff --git a/chrome/browser/ui/views/ash/chrome_shell_delegate.cc b/chrome/browser/ui/views/ash/chrome_shell_delegate.cc
index 4cc63e4b4579d4172f428662ccd1dc1ecf768174..b8514439e94551462cbd125edf01993fd6a11e01 100644
--- a/chrome/browser/ui/views/ash/chrome_shell_delegate.cc
+++ b/chrome/browser/ui/views/ash/chrome_shell_delegate.cc
@@ -191,6 +191,10 @@ void ChromeShellDelegate::OpenMobileSetup() {
 #endif
 }
 
+content::BrowserContext* ChromeShellDelegate::GetCurrentBrowserContext() {
+  return ProfileManager::GetDefaultProfile();
+}
+
 void ChromeShellDelegate::ToggleSpokenFeedback() {
 #if defined(OS_CHROMEOS)
   content::WebUI* login_screen_web_ui = NULL;