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 3304917b491b251b2940d4e550d2b85cec62b4ca..2b501f5aebcc4092b648b07e1d6c3c41045cec50 100644
--- a/chrome/browser/ui/ash/session_controller_client_unittest.cc
+++ b/chrome/browser/ui/ash/session_controller_client_unittest.cc
@@ -121,10 +121,9 @@ 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: