Move more from WmShell to Shell

ash/common/wm/maximize_mode/maximize_mode_event_handler.cc

Index: ash/common/wm/maximize_mode/maximize_mode_event_handler.cc
diff --git a/ash/common/wm/maximize_mode/maximize_mode_event_handler.cc b/ash/common/wm/maximize_mode/maximize_mode_event_handler.cc
index 49905c80f148de927c38046582d4c4ac32f88453..7c3d36d249f4101d7a3a614f1fc539b9967629b9 100644
--- a/ash/common/wm/maximize_mode/maximize_mode_event_handler.cc
+++ b/ash/common/wm/maximize_mode/maximize_mode_event_handler.cc
@@ -10,6 +10,7 @@
 #include "ash/common/wm/wm_event.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
+#include "ash/shell.h"
 #include "ui/events/event.h"
 
 namespace ash {
@@ -55,7 +56,7 @@ bool MaximizeModeEventHandler::ToggleFullscreen(const ui::TouchEvent& event) {
 
   // Do not exit fullscreen in kiosk mode.
   SystemTrayDelegate* system_tray_delegate =
-      WmShell::Get()->system_tray_delegate();
+      Shell::Get()->system_tray_delegate();
   if (system_tray_delegate->GetUserLoginStatus() == LoginStatus::KIOSK_APP ||
       system_tray_delegate->GetUserLoginStatus() ==
           LoginStatus::ARC_KIOSK_APP) {