Always use ChannelMojo for content child processes.

ipc/ipc_channel_posix.cc

 // Copyright (c) 2012 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 "ipc/ipc_channel_posix.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 33 matching lines @@
 #include "base/strings/string_util.h"
 #include "base/synchronization/lock.h"
 #include "build/build_config.h"
 #include "ipc/attachment_broker.h"
 #include "ipc/ipc_descriptors.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_logging.h"
 #include "ipc/ipc_message_attachment_set.h"
 #include "ipc/ipc_message_utils.h"
 #include "ipc/ipc_platform_file_attachment_posix.h"
-#include "ipc/ipc_switches.h"
 #include "ipc/unix_domain_socket_util.h"
 
 namespace IPC {
 
 // IPC channels on Windows use named pipes (CreateNamedPipe()) with
 // channel ids as the pipe names.  Channels on POSIX use sockets as
 // pipes  These don't quite line up.
 //
 // When creating a child subprocess we use a socket pair and the parent side of
 // the fork arranges it such that the initial control channel ends up on the
@@ skipping 1072 matching lines @@
 // static
 void Channel::SetGlobalPid(int pid) {
   ChannelPosix::SetGlobalPid(pid);
 }
 int Channel::GetGlobalPid() {
   return ChannelPosix::GetGlobalPid();
 }
 #endif  // OS_LINUX
 
 }  // namespace IPC