Move yet more from WmShell to Shell

ash/common/wm/window_cycle_controller.cc

Index: ash/common/wm/window_cycle_controller.cc
diff --git a/ash/common/wm/window_cycle_controller.cc b/ash/common/wm/window_cycle_controller.cc
index 7b6cfe5d5edb6a7ed8c063d5cfda20f6136c7f6c..b3cd51caf66ac34e8d2f1ae92f89ab9bfe36fe77 100644
--- a/ash/common/wm/window_cycle_controller.cc
+++ b/ash/common/wm/window_cycle_controller.cc
@@ -39,7 +39,7 @@ WindowCycleController::~WindowCycleController() {}
 bool WindowCycleController::CanCycle() {
   // Prevent window cycling if the screen is locked or a modal dialog is open.
   WmShell* wm_shell = WmShell::Get();
-  return !wm_shell->session_controller()->IsScreenLocked() &&
+  return !Shell::Get()->session_controller()->IsScreenLocked() &&
          !wm_shell->IsSystemModalWindowOpen() && !wm_shell->IsPinned();
 }