Enable use_once_callback on mojom GN rule by default

components/arc/BUILD.gn

 # Copyright 2015 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.
 
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 static_library("arc") {
   sources = [
     "arc_service_manager.cc",
@@ skipping 150 matching lines @@
     "common/video_accelerator.mojom",
     "common/voice_interaction_arc_home.mojom",
     "common/voice_interaction_framework.mojom",
     "common/wallpaper.mojom",
   ]
 
   public_deps = [
     "//mojo/common:common_custom_types",
     "//ui/gfx/geometry/mojo",
   ]
+
+  # TODO(crbug.com/714018): Convert the implementation to use OnceCallback.
+  use_once_callback = false
 }
 
 static_library("arc_test_support") {
   testonly = true
   sources = [
     "test/fake_app_instance.cc",
     "test/fake_app_instance.h",
     "test/fake_arc_session.cc",
     "test/fake_arc_session.h",
     "test/fake_bluetooth_instance.cc",
@@ skipping 50 matching lines @@
     "//testing/gtest",
     "//ui/aura",
     "//ui/aura:test_support",
     "//ui/base:test_support",
     "//ui/base/ime",
     "//ui/events",
     "//ui/events:dom_keycode_converter",
     "//url:url",
   ]
 }