Use OnceCallback on Mojo interfaces in //ash

chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc

 // Copyright 2014 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/app_window_launcher_item_controller.h"
 
 #include <algorithm>
+#include <utility>
 
 #include "ash/wm/window_util.h"
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
 #include "chrome/browser/ui/ash/launcher/launcher_controller_helper.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
 #include "ui/base/base_window.h"
 #include "ui/wm/core/window_animations.h"
 
@@ skipping 50 matching lines @@
 
 AppWindowLauncherItemController*
 AppWindowLauncherItemController::AsAppWindowLauncherItemController() {
   return this;
 }
 
 void AppWindowLauncherItemController::ItemSelected(
     std::unique_ptr<ui::Event> event,
     int64_t display_id,
     ash::ShelfLaunchSource source,
-    const ItemSelectedCallback& callback) {
+    ItemSelectedCallback callback) {
   if (windows_.empty()) {
-    callback.Run(ash::SHELF_ACTION_NONE, base::nullopt);
+    std::move(callback).Run(ash::SHELF_ACTION_NONE, base::nullopt);
     return;
   }
 
   ui::BaseWindow* window_to_show =
       last_active_window_ ? last_active_window_ : windows_.front();
   // If the event was triggered by a keystroke, we try to advance to the next
   // item if the window we are trying to activate is already active.
   ash::ShelfAction action = ash::SHELF_ACTION_NONE;
   if (windows_.size() >= 1 && window_to_show->IsActive() && event &&
       event->type() == ui::ET_KEY_RELEASED) {
     action = ActivateOrAdvanceToNextAppWindow(window_to_show);
   } else {
     action = ShowAndActivateOrMinimize(window_to_show);
   }
 
-  callback.Run(action, GetAppMenuItems(event ? event->flags() : ui::EF_NONE));
+  std::move(callback).Run(
+      action, GetAppMenuItems(event ? event->flags() : ui::EF_NONE));
 }
 
 void AppWindowLauncherItemController::ExecuteCommand(uint32_t command_id,
                                                      int32_t event_flags) {
   // This delegate does not support showing an application menu.
   NOTIMPLEMENTED();
 }
 
 void AppWindowLauncherItemController::Close() {
   // Note: Closing windows may affect the contents of app_windows_.
@@ skipping 48 matching lines @@
   if (window_to_show->IsActive()) {
     // Coming here, only a single window is active. For keyboard activations
     // the window gets animated.
     AnimateWindow(window_to_show->GetNativeWindow(),
                   wm::WINDOW_ANIMATION_TYPE_BOUNCE);
   } else {
     return ShowAndActivateOrMinimize(window_to_show);
   }
   return ash::SHELF_ACTION_NONE;
 }