Use OnceCallback on Mojo interfaces in //ash

chrome/browser/ui/ash/session_controller_client_unittest.cc

Index: chrome/browser/ui/ash/session_controller_client_unittest.cc
diff --git a/chrome/browser/ui/ash/session_controller_client_unittest.cc b/chrome/browser/ui/ash/session_controller_client_unittest.cc
index 660e1a89e1c93125a3518ac7cfe2c5ca362a60f5..c442e18b7023c8f665bf1ddfb6db9c34ec2c5188 100644
--- a/chrome/browser/ui/ash/session_controller_client_unittest.cc
+++ b/chrome/browser/ui/ash/session_controller_client_unittest.cc
@@ -101,10 +101,9 @@ class TestSessionController : public ash::mojom::SessionController {
   }
   void SetUserSessionOrder(
       const std::vector<uint32_t>& user_session_order) override {}
-  void StartLock(const StartLockCallback& callback) override {}
+  void StartLock(StartLockCallback callback) override {}
   void NotifyChromeLockAnimationsComplete() override {}
-  void RunUnlockAnimation(const RunUnlockAnimationCallback& callback) override {
-  }
+  void RunUnlockAnimation(RunUnlockAnimationCallback callback) override {}
   void NotifyChromeTerminating() override {}
 
  private: