Switch to standard integer types in ppapi/.

ppapi/tests/test_file_io.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 "ppapi/tests/test_file_io.h"
 
 #include <errno.h>
 #include <fcntl.h>
+#include <stddef.h>
 #include <stdio.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 
 #include <algorithm>
 #include <vector>
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_file_io.h"
@@ skipping 1341 matching lines @@
   if ((invalid_combination && callback.result() == PP_OK) ||
       (!invalid_combination &&
        ((callback.result() == PP_OK) != create_if_doesnt_exist))) {
     return ReportOpenError(open_flags);
   }
 
   return std::string();
 }
 
 // TODO(viettrungluu): Test Close(). crbug.com/69457