Switch to standard integer types in ipc/.

BUG=138542
TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1546533002

Cr-Commit-Position: refs/heads/master@{#366527}


CrOS-Libchrome-Original-Commit: 246998d858d0ac220ab272b1af0ef0c6599fe92c
diff --git a/ipc/ipc_message_attachment_set.cc b/ipc/ipc_message_attachment_set.cc
index 16446c5..3b7eefb 100644
--- a/ipc/ipc_message_attachment_set.cc
+++ b/ipc/ipc_message_attachment_set.cc
@@ -4,15 +4,19 @@
 
 #include "ipc/ipc_message_attachment_set.h"
 
+#include <stddef.h>
+
 #include <algorithm>
+
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
+#include "build/build_config.h"
 #include "ipc/brokerable_attachment.h"
 #include "ipc/ipc_message_attachment.h"
 
 #if defined(OS_POSIX)
-#include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/types.h>
 #include <unistd.h>
 #include "ipc/ipc_platform_file_attachment_posix.h"
 #endif // OS_POSIX