cros: Disable system tray help/lock buttons during supervised user creation

ash/system/tiles/tray_tiles.cc

Index: ash/system/tiles/tray_tiles.cc
diff --git a/ash/system/tiles/tray_tiles.cc b/ash/system/tiles/tray_tiles.cc
index 360c8528928451f1fb910eb18e0538a0fadd2775..60e9024f7c43241b07182c8caaccc27c6e2748f0 100644
--- a/ash/system/tiles/tray_tiles.cc
+++ b/ash/system/tiles/tray_tiles.cc
@@ -5,7 +5,6 @@
 #include "ash/system/tiles/tray_tiles.h"
 
 #include "ash/metrics/user_metrics_action.h"
-#include "ash/session/session_state_delegate.h"
 #include "ash/system/tiles/tiles_default_view.h"
 
 namespace ash {
@@ -25,13 +24,14 @@ TilesDefaultView* TrayTiles::GetDefaultViewForTesting() const {
   return default_view_;
 }
 
-views::View* TrayTiles::CreateDefaultViewForTesting(LoginStatus status) {
-  return CreateDefaultView(status);
+views::View* TrayTiles::CreateDefaultViewForTesting() {
+  // Login status is unused.
+  return CreateDefaultView(LoginStatus::USER);
 }
 
 views::View* TrayTiles::CreateDefaultView(LoginStatus status) {
   CHECK(default_view_ == nullptr);
-  default_view_ = new TilesDefaultView(this, status);
+  default_view_ = new TilesDefaultView(this);
   default_view_->Init();
   return default_view_;
 }