Remove unused parts of IPC::ChannelHandle.

ipc/ipc_channel_nacl.h

 // 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.
 
 #ifndef IPC_IPC_CHANNEL_NACL_H_
 #define IPC_IPC_CHANNEL_NACL_H_
 
 #include <deque>
 #include <memory>
 #include <string>
@@ skipping 57 matching lines @@
   bool DidEmptyInputBuffers() override;
   void HandleInternalMessage(const Message& msg) override;
   base::ProcessId GetSenderPID() override;
 
   Mode mode_;
   bool waiting_connect_;
 
   // The pipe used for communication.
   int pipe_;
 
-  // The "name" of our pipe.  On Windows this is the global identifier for
-  // the pipe.  On POSIX it's used as a key in a local map of file descriptors.
-  // For NaCl, we don't actually support looking up file descriptors by name,
-  // and it's only used for debug information.
-  std::string pipe_name_;
-
   // We use a thread for reading, so that we can simply block on reading and
   // post the received data back to the main thread to be properly interleaved
   // with other tasks in the MessagePump.
   //
   // imc_recvmsg supports non-blocking reads, but there's no easy way to be
   // informed when a write or read can be done without blocking (this is handled
   // by libevent in Posix).
   std::unique_ptr<ReaderThreadRunner> reader_thread_runner_;
   std::unique_ptr<base::DelegateSimpleThread> reader_thread_;
 
@@ skipping 22 matching lines @@
   std::deque<linked_ptr<Message> > output_queue_;
 
   base::WeakPtrFactory<ChannelNacl> weak_ptr_factory_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChannelNacl);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_NACL_H_