Switch to standard integer types in mojo/.

mojo/public/cpp/bindings/lib/message_builder.h

 // Copyright 2013 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.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_MESSAGE_BUILDER_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_MESSAGE_BUILDER_H_
 
+#include <stddef.h>
 #include <stdint.h>
 
 #include "mojo/public/cpp/bindings/lib/message_internal.h"
 #include "mojo/public/cpp/bindings/message.h"
 
 namespace mojo {
 class Message;
 
 namespace internal {
 
@@ skipping 39 matching lines @@
       : MessageWithRequestIDBuilder(name,
                                     payload_size,
                                     kMessageIsResponse,
                                     request_id) {}
 };
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_MESSAGE_BUILDER_H_