Switch to standard integer types in mojo/.

mojo/edk/embedder/platform_channel_pair_posix.cc

 // Copyright 2014 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 "mojo/edk/embedder/platform_channel_pair.h"
 
 #include <fcntl.h>
+#include <stddef.h>
 #include <stdint.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/posix/global_descriptors.h"
@@ skipping 118 matching lines @@
   while (IsTargetDescriptorUsed(*handle_passing_info, target_fd))
     target_fd++;
 
   handle_passing_info->push_back(
       std::pair<int, int>(client_handle_.get().handle, target_fd));
   return base::IntToString(target_fd);
 }
 
 }  // namespace edk
 }  // namespace mojo