Switch to standard integer types in chromeos/.

chromeos/system/version_loader.cc

 // Copyright (c) 2011 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 "chromeos/system/version_loader.h"
 
+#include <stddef.h>
+
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/sys_info.h"
 #include "base/time/time.h"
@@ skipping 67 matching lines @@
       size_t found = str.find_first_not_of("| ");
       if (found != std::string::npos)
         return str.substr(found);
     }
   }
   return std::string();
 }
 
 }  // namespace version_loader
 }  // namespace chromeos