Switch to standard integer types in mojo/.

mojo/public/cpp/bindings/lib/string_serialization.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/public/cpp/bindings/lib/string_serialization.h"
 
+#include <stddef.h>
 #include <string.h>
 
 namespace mojo {
 
 size_t GetSerializedSize_(const String& input) {
   if (!input)
     return 0;
   return internal::Align(sizeof(internal::String_Data) + input.size());
 }
 
@@ skipping 17 matching lines @@
   if (input) {
     String result(input->storage(), input->size());
     result.Swap(output);
   } else {
     output->reset();
   }
   return true;
 }
 
 }  // namespace mojo