Use OnceCallback on Mojo interfaces in //ash

chrome/browser/ui/ash/session_controller_client_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/ash/session_controller_client.h"
 
 #include <memory>
 #include <string>
 #include <vector>
 
@@ skipping 83 matching lines @@
   void SetClient(ash::mojom::SessionControllerClientPtr client) override {}
   void SetSessionInfo(ash::mojom::SessionInfoPtr info) override {
     last_session_info_ = info->Clone();
   }
   void UpdateUserSession(ash::mojom::UserSessionPtr user_session) override {
     last_user_session_ = user_session->Clone();
     update_user_session_count_++;
   }
   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:
   mojo::Binding<ash::mojom::SessionController> binding_;
 
   ash::mojom::SessionInfoPtr last_session_info_;
   ash::mojom::UserSessionPtr last_user_session_;
   int update_user_session_count_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(TestSessionController);
@@ skipping 332 matching lines @@
 
   // Simulate an update to the custodian information.
   prefs->SetString(prefs::kSupervisedUserCustodianEmail, "parent3@test.com");
   client.OnCustodianInfoChanged();
   SessionControllerClient::FlushForTesting();
 
   // The updated custodian was sent over the mojo interface.
   EXPECT_EQ("parent3@test.com",
             session_controller.last_user_session()->custodian_email);
 }