chromeos: Promotes more from WmShell to Shell

ash/system/chromeos/power/tablet_power_button_controller.cc

Index: ash/system/chromeos/power/tablet_power_button_controller.cc
diff --git a/ash/system/chromeos/power/tablet_power_button_controller.cc b/ash/system/chromeos/power/tablet_power_button_controller.cc
index fcdf81b5d557853662693e3212618d94b0fb1d1f..9020e8af9168128b55ce4010f4d8def8dec78768 100644
--- a/ash/system/chromeos/power/tablet_power_button_controller.cc
+++ b/ash/system/chromeos/power/tablet_power_button_controller.cc
@@ -216,7 +216,7 @@ void TabletPowerButtonController::SetDisplayForcedOff(bool forced_off) {
       ->SetBacklightsForcedOff(forced_off);
   backlights_forced_off_ = forced_off;
 
-  ShellDelegate* delegate = WmShell::Get()->delegate();
+  ShellDelegate* delegate = Shell::Get()->shell_delegate();
   delegate->SetTouchscreenEnabledInPrefs(!forced_off,
                                          true /* use_local_state */);
   delegate->UpdateTouchscreenStatusFromPrefs();