Revert of IPC: Add attachment brokering support to the message header.

ipc/ipc_channel.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 "ipc/ipc_channel.h"
 
 #include <limits>
 
 #include "base/atomic_sequence_num.h"
 #include "base/rand_util.h"
@@ skipping 23 matching lines @@
   int process_id = -1;
 #else
   int process_id = base::GetCurrentProcId();
 #endif
   return base::StringPrintf("%d.%u.%d",
       process_id,
       g_last_id.GetNext(),
       base::RandInt(0, std::numeric_limits<int32>::max()));
 }
 
-Channel::OutputElement::OutputElement(Message* message)
-    : message_(message), buffer_(nullptr), length_(0) {}
-
-Channel::OutputElement::OutputElement(void* buffer, size_t length)
-    : message_(nullptr), buffer_(buffer), length_(length) {}
-
-Channel::OutputElement::~OutputElement() {
-  free(buffer_);
-}
-
-size_t Channel::OutputElement::size() const {
-  if (message_)
-    return message_->size();
-  return length_;
-}
-
-const void* Channel::OutputElement::data() const {
-  if (message_)
-    return message_->data();
-  return buffer_;
-}
-
 }  // namespace IPC