Switch to standard integer types in base/strings/.

base/strings/utf_string_conversions.h

 // 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.
 
 #ifndef BASE_STRINGS_UTF_STRING_CONVERSIONS_H_
 #define BASE_STRINGS_UTF_STRING_CONVERSIONS_H_
 
+#include <stddef.h>
+
 #include <string>
 
 #include "base/base_export.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_piece.h"
 
 namespace base {
 
 // These convert between UTF-8, -16, and -32 strings. They are potentially slow,
 // so avoid unnecessary conversions. The low-level versions return a boolean
@@ skipping 25 matching lines @@
 // string.
 BASE_EXPORT string16 ASCIIToUTF16(StringPiece ascii);
 
 // Converts to 7-bit ASCII by truncating. The result must be known to be ASCII
 // beforehand.
 BASE_EXPORT std::string UTF16ToASCII(StringPiece16 utf16);
 
 }  // namespace base
 
 #endif  // BASE_STRINGS_UTF_STRING_CONVERSIONS_H_