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

services/ui/public/interfaces/channel_handle.mojom

Index: services/ui/public/interfaces/channel_handle.mojom
diff --git a/services/ui/public/interfaces/channel_handle.mojom b/services/ui/public/interfaces/channel_handle.mojom
deleted file mode 100644
index a0ffc10448d97b59767cb36c5498f711fe2b4724..0000000000000000000000000000000000000000
--- a/services/ui/public/interfaces/channel_handle.mojom
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2016 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.
-
-module ui.mojom;
-
-// See IPC::ChannelHandle in src/ipc/ipc_channel_handle.h
-struct ChannelHandle {
-  string name;
-
-  // On POSIX, it is one endpoint of a socket pair. On Windows, it is not used.
-  handle? socket;
-
-  // Message pipe handle used for ChannelMojo.
-  handle<message_pipe>? mojo_handle;
-};