services/ui: Get rid of IPC::ChannelHandle type converter

services/ui/public/interfaces/BUILD.gn

 # 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.
 
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 mojom("interfaces") {
   sources = [
     "accelerator_registrar.mojom",
     "accessibility_manager.mojom",
     "animations.mojom",
-    "channel_handle.mojom",
     "clipboard.mojom",
     "cursor.mojom",
     "display.mojom",
     "event_matcher.mojom",
     "gpu_memory_buffer.mojom",
     "gpu_service.mojom",
     "ime.mojom",
     "mus_constants.mojom",
     "surface.mojom",
     "user_access_manager.mojom",
@@ skipping 35 matching lines @@
   deps = [
     "//base",
     "//base/test:test_support",
     "//mojo/edk/test:run_all_unittests",
     "//services/ui/public/interfaces/display:test_interfaces",
     "//testing/gtest",
     "//ui/display/types",
     "//ui/gfx:test_support",
   ]
 }