ipc: Remove unnecessary attachment broker plumbing.

ipc/ipc_fuzzing_tests.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 <stdint.h>
 #include <stdio.h>
 
 #include <limits>
 #include <sstream>
 #include <string>
@@ skipping 241 matching lines @@
 
   IPC::Message* last_msg_;
 };
 
 // Runs the fuzzing server child mode. Returns when the preset number of
 // messages have been received.
 MULTIPROCESS_IPC_TEST_CLIENT_MAIN(FuzzServerClient) {
   base::MessageLoopForIO main_message_loop;
   FuzzerServerListener listener;
   scoped_ptr<IPC::Channel> channel(IPC::Channel::CreateClient(
-      IPCTestBase::GetChannelName("FuzzServerClient"), &listener, nullptr));
+      IPCTestBase::GetChannelName("FuzzServerClient"), &listener));
   CHECK(channel->Connect());
   listener.Init(channel.get());
   base::MessageLoop::current()->Run();
   return 0;
 }
 
 class IPCFuzzingTest : public IPCTestBase {
 };
 
 #if defined(OS_ANDROID)
@@ skipping 91 matching lines @@
   // thrown out of sync by the extra argument.
   msg = new MsgClassIS(3, base::ASCIIToUTF16("expect three"));
   sender()->Send(msg);
   EXPECT_TRUE(listener.ExpectMessage(3, MsgClassIS::ID));
 
   EXPECT_TRUE(WaitForClientShutdown());
   DestroyChannel();
 }
 
 }  // namespace