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

chrome/browser/chromeos/setting_level_bubble.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/chromeos/setting_level_bubble.h"
 
 #include <algorithm>
 
 #include "chrome/browser/chromeos/login/background_view.h"
+#include "chrome/browser/chromeos/login/existing_user_controller.h"
 #include "chrome/browser/chromeos/login/login_utils.h"
+#include "chrome/browser/chromeos/login/login_display_host.h"
 #include "chrome/browser/chromeos/login/webui_login_display.h"
 #include "chrome/browser/chromeos/setting_level_bubble_view.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "ui/gfx/screen.h"
 #include "views/bubble/bubble_delegate.h"
 #include "views/layout/fill_layout.h"
 #include "views/widget/root_view.h"
@@ skipping 46 matching lines @@
           ProfileManager::GetDefaultProfile(),
           true);  // match_incognito
   if (browser) {
     window = browser->window()->GetNativeHandle();
   } else {
 #if defined(USE_AURA)
     // TODO(saintlou): Unsure what to do for the Aura background.
 #else
     // Otherwise, see if there's a background window that we can use.
     BackgroundView* background = LoginUtils::Get()->GetBackgroundView();
-    if (background)
+    if (background) {
       window = GTK_WINDOW(background->GetNativeWindow());
+    } else {
+      ExistingUserController* controller =
+          ExistingUserController::current_controller();
+      if (controller) {
+        window =
+            GTK_WINDOW(controller->login_display_host()->GetNativeWindow());
+      }
+    }
 #endif
   }
 
-  if (window)
+  if (window) {
     return views::Widget::GetWidgetForNativeWindow(window);
-  else
-    return WebUILoginDisplay::GetLoginWindow();
+  } else {
+    NOTREACHED();
+    return NULL;
+  }
 }
 
 // SettingLevelBubbleDelegateView ----------------------------------------------
 class SettingLevelBubbleDelegateView : public views::BubbleDelegateView {
  public:
   // BubbleDelegate overrides:
   virtual gfx::Point GetAnchorPoint() OVERRIDE;
 
   // Create the bubble delegate view.
   explicit SettingLevelBubbleDelegateView(views::Widget* parent);
@@ skipping 199 matching lines @@
 
   last_target_update_time_ = now;
 }
 
 void SettingLevelBubble::StopAnimation() {
   animation_timer_.Stop();
   is_animating_ = false;
 }
 
 }  // namespace chromeos