Add GetScreenMode() to status_area_host.h.

chrome/browser/chromeos/login/background_view.cc

Index: chrome/browser/chromeos/login/background_view.cc
diff --git a/chrome/browser/chromeos/login/background_view.cc b/chrome/browser/chromeos/login/background_view.cc
index 447432626b7c70c4ee9ae273f3aa8b51f4e32c69..cf6da1b538d454aba8eb2c38f1b4aa3453c3b7d5 100644
--- a/chrome/browser/chromeos/login/background_view.cc
+++ b/chrome/browser/chromeos/login/background_view.cc
@@ -327,12 +327,8 @@ void BackgroundView::OpenButtonOptions(const views::View* button_view) {
   }
 }
 
-bool BackgroundView::IsBrowserMode() const {
-  return false;
-}
-
-bool BackgroundView::IsScreenLockerMode() const {
-  return false;
+StatusAreaHost::ScreenMode BackgroundView::GetScreenMode() const {
+  return kLoginMode;
 }
 
 // Overridden from LoginHtmlDialog::Delegate: