Switch to standard integer types in ipc/.

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 <stddef.h>
 #include <stdint.h>
 
 #include <limits>
 
 #include "base/atomic_sequence_num.h"
 #include "base/rand_util.h"
 #include "base/strings/stringprintf.h"
+#include "build/build_config.h"
 
 namespace {
 
 // Global atomic used to guarantee channel IDs are unique.
 base::StaticAtomicSequenceNumber g_last_id;
 
 }  // namespace
 
 namespace IPC {
 
@@ skipping 23 matching lines @@
     : 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_);
 }
 
 }  // namespace IPC