Use OnceCallback on Mojo interfaces in //ash

chrome/browser/ui/ash/launcher/chrome_launcher_controller_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/launcher/chrome_launcher_controller.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <map>
@@ skipping 246 matching lines @@
  public:
   explicit TestV2AppLauncherItemController(const std::string& app_id)
       : ash::ShelfItemDelegate(ash::ShelfID(app_id)) {}
 
   ~TestV2AppLauncherItemController() override {}
 
   // Override for ash::ShelfItemDelegate:
   void ItemSelected(std::unique_ptr<ui::Event> event,
                     int64_t display_id,
                     ash::ShelfLaunchSource source,
-                    const ItemSelectedCallback& callback) override {
-    callback.Run(ash::SHELF_ACTION_WINDOW_ACTIVATED, base::nullopt);
+                    ItemSelectedCallback callback) override {
+    std::move(callback).Run(ash::SHELF_ACTION_WINDOW_ACTIVATED, base::nullopt);
   }
   void ExecuteCommand(uint32_t command_id, int32_t event_flags) override {}
   void Close() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestV2AppLauncherItemController);
 };
 
 // A test ShelfController implementation that tracks alignment and auto-hide.
 class TestShelfController : public ash::mojom::ShelfController {
@@ skipping 3937 matching lines @@
   EXPECT_EQ(ash::SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS,
             shelf_controller->auto_hide());
   EXPECT_EQ(2u, shelf_controller->auto_hide_change_count());
 
   PrefService* prefs = profile()->GetTestingPrefService();
   EXPECT_EQ("Left", prefs->GetString(prefs::kShelfAlignmentLocal));
   EXPECT_EQ("Left", prefs->GetString(prefs::kShelfAlignment));
   EXPECT_EQ("Always", prefs->GetString(prefs::kShelfAutoHideBehaviorLocal));
   EXPECT_EQ("Always", prefs->GetString(prefs::kShelfAutoHideBehavior));
 }