Fold //ipc/mojo into //ipc.

ipc/mojo/ipc.mojom

-// 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 IPC.mojom;
-
-struct SerializedHandle {
-  handle the_handle;
-
-  enum Type {
-    MOJO_HANDLE,
-    PLATFORM_FILE,
-    WIN_HANDLE,
-    MACH_PORT,
-  };
-
-  Type type;
-};
-
-interface Channel {
-  Receive(array<uint8> data, array<SerializedHandle>? handles);
-};
-
-// An interface for connecting a pair of Channel interfaces representing a
-// bidirectional IPC channel.
-interface Bootstrap {
-  // Initializes a Chrome IPC channel over |to_client_channel| and
-  // |to_server_channel|. Each side also sends its PID to the other side.
-  Init(associated Channel& to_client_channel,
-       associated Channel to_server_channel,
-       int32 pid) => (int32 pid);
-};