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

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

 // Copyright (c) 2011 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 "chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 144 matching lines @@
   user_photo_ = photo;
   selected_image_ = UserManager::User::kExternalImageIndex;
   base::StringValue data_url(web_ui_util::GetImageDataUrl(user_photo_));
   web_ui_->CallJavascriptFunction("oobe.UserImageScreen.setUserPhoto",
                                   data_url);
 }
 
 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();
 }
 
 void UserImageScreenHandler::HandleSelectImage(const base::ListValue* args) {
   std::string image_url;
   if (!args ||
       args->GetSize() != 1 ||
       !args->GetString(0, &image_url)) {
@@ skipping 33 matching lines @@
 }
 
 void UserImageScreenHandler::OnCameraPresenceCheckDone() {
   base::FundamentalValue present_value(
       CameraDetector::camera_presence() == CameraDetector::kCameraPresent);
   web_ui_->CallJavascriptFunction("oobe.UserImageScreen.setCameraPresent",
                                   present_value);
 }
 
 }  // namespace chromeos