[cros,de-hack] Get rid of singleton for the WebUILoginScreen.

chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc
index 59658a1bb4d6d7406f5751fe9cabcb737d830a95..2d78d9ec776711cd5bb1d9ac6ad352577a8481a0 100644
--- a/chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc
@@ -162,9 +162,8 @@ void UserImageScreenHandler::OnPhotoAccepted(const SkBitmap& photo) {
 void UserImageScreenHandler::HandleTakePhoto(const base::ListValue* args) {
   DCHECK(args && args->empty());
   TakePhotoDialog* take_photo_dialog = new TakePhotoDialog(this);
-  views::Widget* login_window = WebUILoginDisplay::GetLoginWindow();
   views::Widget* window = browser::CreateViewsWindow(
-      login_window->GetNativeWindow(),
+      GetNativeWindow(),
       take_photo_dialog);
   window->SetAlwaysOnTop(true);
   window->Show();