Add some bullet proofing to ipc_channel_posix.

ipc/ipc_channel_posix.h

 // Copyright (c) 2008 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.
 
 #ifndef IPC_IPC_CHANNEL_POSIX_H_
 #define IPC_IPC_CHANNEL_POSIX_H_
 #pragma once
 
 #include "ipc/ipc_channel.h"
 
@@ skipping 122 matching lines @@
   // Large messages that span multiple pipe buffers, get built-up using
   // this buffer.
   std::string input_overflow_buf_;
   std::vector<int> input_overflow_fds_;
 
   // True if we are responsible for unlinking the unix domain socket file.
   bool must_unlink_;
 
   ScopedRunnableMethodFactory<ChannelImpl> factory_;
 
-  DISALLOW_COPY_AND_ASSIGN(ChannelImpl);
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ChannelImpl);
 };
 
 // The maximum length of the name of a pipe for MODE_NAMED_SERVER or
 // MODE_NAMED_CLIENT if you want to pass in your own socket.
 // The standard size on linux is 108, mac is 104. To maintain consistency
 // across platforms we standardize on the smaller value.
 static const size_t kMaxPipeNameLength = 104;
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_POSIX_H_