ipc: Remove unnecessary attachment broker plumbing.

ipc/ipc_test_base.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 "build/build_config.h"
 
 #include "base/single_thread_task_runner.h"
 #include "ipc/ipc_test_base.h"
 
 #include "base/command_line.h"
@@ skipping 142 matching lines @@
   return GetChannelName(test_client_name_);
 }
 
 scoped_refptr<base::SequencedTaskRunner> IPCTestBase::task_runner() {
   return message_loop_->task_runner();
 }
 
 scoped_ptr<IPC::ChannelFactory> IPCTestBase::CreateChannelFactory(
     const IPC::ChannelHandle& handle,
     base::SequencedTaskRunner* runner) {
-  return IPC::ChannelFactory::Create(handle, IPC::Channel::MODE_SERVER,
-                                     attachment_broker_);
+  return IPC::ChannelFactory::Create(handle, IPC::Channel::MODE_SERVER);
 }