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

ipc/ipc_message_utils.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_message_utils.h"
 
 #include "base/files/file_path.h"
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/nullable_string16.h"
@@ skipping 434 matching lines @@
   for (size_t i = 0; i < p.size(); ++i) {
     if (i != 0)
       l->push_back(' ');
     LogParam(static_cast<bool>(p[i]), l);
   }
 }
 
 void ParamTraits<BrokerableAttachment::AttachmentId>::Write(
     Message* m,
     const param_type& p) {
-  m->WriteBytes(p.nonce, static_cast<int>(BrokerableAttachment::kNonceSize));
+  m->WriteBytes(p.nonce, BrokerableAttachment::kNonceSize);
 }
 
 bool ParamTraits<BrokerableAttachment::AttachmentId>::Read(
     const Message* m,
     base::PickleIterator* iter,
     param_type* r) {
   const char* data;
-  if (!iter->ReadBytes(&data,
-                       static_cast<int>(BrokerableAttachment::kNonceSize))) {
+  if (!iter->ReadBytes(&data, BrokerableAttachment::kNonceSize))
     return false;
-  }
   memcpy(r->nonce, data, BrokerableAttachment::kNonceSize);
   return true;
 }
 
 void ParamTraits<BrokerableAttachment::AttachmentId>::Log(const param_type& p,
                                                           std::string* l) {
   l->append(base::HexEncode(p.nonce, BrokerableAttachment::kNonceSize));
 }
 
 void ParamTraits<base::DictionaryValue>::Write(Message* m,
@@ skipping 469 matching lines @@
   return result;
 }
 
 void ParamTraits<MSG>::Log(const param_type& p, std::string* l) {
   l->append("<MSG>");
 }
 
 #endif  // OS_WIN
 
 }  // namespace IPC