ipc: Remove unnecessary attachment broker plumbing.

content/test/render_thread_impl_browser_test_ipc_helper.cc

 // Copyright 2014 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/test/render_thread_impl_browser_test_ipc_helper.h"
 
 #include "content/common/mojo/channel_init.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
@@ skipping 10 matching lines @@
   channel_id_ = IPC::Channel::GenerateVerifiedChannelID("");
   dummy_listener_.reset(new DummyListener());
 
   SetupIpcThread();
 
   if (IPC::ChannelMojo::ShouldBeUsed()) {
     SetupMojo();
   } else {
     channel_ = IPC::ChannelProxy::Create(channel_id_, IPC::Channel::MODE_SERVER,
                                          dummy_listener_.get(),
-                                         ipc_thread_->task_runner(), nullptr);
+                                         ipc_thread_->task_runner());
   }
 }
 
 RenderThreadImplBrowserIPCTestHelper::~RenderThreadImplBrowserIPCTestHelper() {
 }
 
 void RenderThreadImplBrowserIPCTestHelper::SetupIpcThread() {
   ipc_thread_.reset(new base::Thread("test_ipc_thread"));
   base::Thread::Options options;
   options.message_loop_type = base::MessageLoop::TYPE_IO;
   ASSERT_TRUE(ipc_thread_->StartWithOptions(options));
 }
 
 void RenderThreadImplBrowserIPCTestHelper::SetupMojo() {
   InitializeMojo();
 
   ipc_support_.reset(new IPC::ScopedIPCSupport(ipc_thread_->task_runner()));
   mojo_application_host_.reset(new MojoApplicationHost());
   mojo_application_host_->OverrideIOTaskRunnerForTest(
       ipc_thread_->task_runner());
 
   channel_ = IPC::ChannelProxy::Create(
       IPC::ChannelMojo::CreateServerFactory(ipc_thread_->task_runner(),
-                                            channel_id_, nullptr),
+                                            channel_id_),
       dummy_listener_.get(), ipc_thread_->task_runner());
 
   mojo_application_host_->Init();
   mojo_application_host_->Activate(channel_.get(),
                                    base::GetCurrentProcessHandle());
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 RenderThreadImplBrowserIPCTestHelper::GetIOTaskRunner() const {
   return ipc_thread_->task_runner();
 }
 
 }  // namespace content