Always use ChannelMojo for content child processes.

ipc/ipc_switches.cc

Index: ipc/ipc_switches.cc
diff --git a/ipc/ipc_switches.cc b/ipc/ipc_switches.cc
deleted file mode 100644
index df245f55f266e07590de5d64474a14bcbfde5cfd..0000000000000000000000000000000000000000
--- a/ipc/ipc_switches.cc
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright (c) 2006-2009 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_switches.h"
-
-#include "base/base_switches.h"
-
-namespace switches {
-
-// Can't find the switch you are looking for? try looking in
-// base/base_switches.cc instead.
-
-// The value of this switch tells the child process which
-// IPC channel the browser expects to use to communicate with it.
-const char kProcessChannelID[]              = "channel";
-
-}  // namespace switches
-