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

chrome/browser/chromeos/login/webui_login_display_host.h

Index: chrome/browser/chromeos/login/webui_login_display_host.h
diff --git a/chrome/browser/chromeos/login/webui_login_display_host.h b/chrome/browser/chromeos/login/webui_login_display_host.h
index 9983acc2e674d529b5c8734d7e9d890851fa7b9d..88578a5c52f5d578b59a010564a323c25b0d50c2 100644
--- a/chrome/browser/chromeos/login/webui_login_display_host.h
+++ b/chrome/browser/chromeos/login/webui_login_display_host.h
@@ -17,6 +17,7 @@ class Rect;
 namespace chromeos {
 
 class OobeUI;
+class WebUILoginDisplay;
 class WebUILoginView;
 
 // WebUI-specific implementation of the OOBE/login screen host. Uses
@@ -27,8 +28,8 @@ class WebUILoginDisplayHost : public BaseLoginDisplayHost {
   virtual ~WebUILoginDisplayHost();
 
   // LoginDisplayHost implementation:
-  virtual LoginDisplay* CreateLoginDisplay(LoginDisplay::Delegate* delegate)
-      const OVERRIDE;
+  virtual LoginDisplay* CreateLoginDisplay(
+      LoginDisplay::Delegate* delegate) OVERRIDE;
   virtual gfx::NativeWindow GetNativeWindow() const OVERRIDE;
   virtual void SetOobeProgress(BackgroundView::LoginStep step) OVERRIDE;
   virtual void SetOobeProgressBarVisible(bool visible) OVERRIDE;
@@ -55,6 +56,9 @@ class WebUILoginDisplayHost : public BaseLoginDisplayHost {
   // Container of the view we are displaying.
   WebUILoginView* login_view_;
 
+  // Login display we are using.
+  WebUILoginDisplay* webui_login_display_;
+
   DISALLOW_COPY_AND_ASSIGN(WebUILoginDisplayHost);
 };