Always use ChannelMojo for content child processes.

content/utility/utility_thread_impl.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 "content/utility/utility_thread_impl.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 29 matching lines @@
 }  // namespace
 
 UtilityThreadImpl::UtilityThreadImpl()
     : ChildThreadImpl(ChildThreadImpl::Options::Builder().Build()) {
   Init();
 }
 
 UtilityThreadImpl::UtilityThreadImpl(const InProcessChildThreadParams& params)
     : ChildThreadImpl(ChildThreadImpl::Options::Builder()
                           .InBrowserProcess(params)
-                          .UseMojoChannel(true)
                           .Build()) {
   Init();
 }
 
 UtilityThreadImpl::~UtilityThreadImpl() {
 }
 
 void UtilityThreadImpl::Shutdown() {
   ChildThreadImpl::Shutdown();
 }
@@ skipping 62 matching lines @@
 }
 
 void UtilityThreadImpl::BindServiceFactoryRequest(
     shell::mojom::ServiceFactoryRequest request) {
   DCHECK(service_factory_);
   service_factory_bindings_.AddBinding(service_factory_.get(),
                                        std::move(request));
 }
 
 }  // namespace content