chromeos: Move device shutdown handling out of chrome into ash

ash/test/lock_state_controller_test_api.h

Index: ash/test/lock_state_controller_test_api.h
diff --git a/ash/test/lock_state_controller_test_api.h b/ash/test/lock_state_controller_test_api.h
index 31ca2112fc8b13cbea69e4f30c4922fc3c1efb66..3dcb390fa883a0736a0b549037d17a88cd1eb062 100644
--- a/ash/test/lock_state_controller_test_api.h
+++ b/ash/test/lock_state_controller_test_api.h
@@ -25,7 +25,9 @@ class LockStateControllerTestApi {
   explicit LockStateControllerTestApi(LockStateController* controller);
   ~LockStateControllerTestApi();
 
-  void SetShutdownClient(std::unique_ptr<mojom::ShutdownClient> client);
+  void set_shutdown_controller(ShutdownController* shutdown_controller) {
+    controller_->shutdown_controller_ = shutdown_controller;
+  }
 
   bool lock_fail_timer_is_running() const {
     return controller_->lock_fail_timer_.IsRunning();