Always use ChannelMojo for content child processes.

components/nacl/loader/nacl_helper_linux.cc

 // Copyright 2013 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.
 
 // A mini-zygote specifically for Native Client.
 
 #include "components/nacl/loader/nacl_helper_linux.h"
 
 #include <errno.h>
 #include <fcntl.h>
@@ skipping 22 matching lines @@
 #include "base/process/process_handle.h"
 #include "base/rand_util.h"
 #include "build/build_config.h"
 #include "components/nacl/common/nacl_switches.h"
 #include "components/nacl/loader/sandbox_linux/nacl_sandbox_linux.h"
 #include "content/public/common/content_descriptors.h"
 #include "content/public/common/mojo_channel_switches.h"
 #include "content/public/common/send_zygote_child_ping_linux.h"
 #include "content/public/common/zygote_fork_delegate_linux.h"
 #include "ipc/ipc_descriptors.h"
-#include "ipc/ipc_switches.h"
 #include "mojo/edk/embedder/embedder.h"
 #include "sandbox/linux/services/credentials.h"
 #include "sandbox/linux/services/namespace_sandbox.h"
 
 #if defined(OS_NACL_NONSFI)
 #include "components/nacl/loader/nonsfi/nonsfi_listener.h"
 #include "native_client/src/public/nonsfi/irt_exception_handling.h"
 #else
 #include <link.h>
 #include "components/nacl/loader/nacl_listener.h"
@@ skipping 414 matching lines @@
   // Now handle requests from the Zygote.
   while (true) {
     bool request_handled = HandleZygoteRequest(
         kNaClZygoteDescriptor, system_info, nacl_sandbox.get());
     // Do not turn this into a CHECK() without thinking about robustness
     // against malicious IPC requests.
     DCHECK(request_handled);
   }
   NOTREACHED();
 }