Fix Clang build after landing http://codereview.chromium.org/6670085/

net/ftp/ftp_directory_listing_parser.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 NET_FTP_FTP_DIRECTORY_LISTING_PARSER_H_
 #define NET_FTP_FTP_DIRECTORY_LISTING_PARSER_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/string16.h"
 #include "base/time.h"
 
 namespace net {
 
 struct FtpDirectoryListingEntry {
   enum Type {
     FILE,
     DIRECTORY,
     SYMLINK,
   };
 
+  FtpDirectoryListingEntry();
+
   Type type;
   string16 name;  // Name (UTF-16-encoded).
   std::string raw_name;  // Name in original character encoding.
   int64 size;  // File size, in bytes. -1 if not applicable.
 
   // Last modified time, in local time zone.
   base::Time last_modified;
 };
 
 // Parses an FTP directory listing |text|. On success fills in |entries|.
 // Returns network error code.
 int ParseFtpDirectoryListing(const std::string& text,
                              const base::Time& current_time,
                              std::vector<FtpDirectoryListingEntry>* entries);
 
 }  // namespace net
 
 #endif  // NET_FTP_FTP_DIRECTORY_LISTING_PARSER_H_