Revert "Fix a ton of compiler warnings."

chrome/browser/parsers/metadata_parser_factory.h

 // Copyright (c) 2009 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 CHROME_BROWSER_METADATA_PARSER_FACTORY_H_
 #define CHROME_BROWSER_METADATA_PARSER_FACTORY_H_
 
 #include "chrome/browser/parsers/metadata_parser.h"
 
 // Used to check to see if a parser can parse a particular file, and allows
 // for creation of a parser on a particular file.
 class MetadataParserFactory {
  public:
   MetadataParserFactory() {}
-  virtual ~MetadataParserFactory() {}
 
   // Used to check to see if the parser can parse the given file. This
   // should not do any additional reading of the file.
   virtual bool CanParse(const FilePath& path,
                         char* bytes,
                         int bytes_size) = 0;
 
   // Creates the parser on the given file.  Creating the parser does not
   // do any parsing on the file.  Parse has to be called on the parser.
   virtual MetadataParser* CreateParser(const FilePath& path) = 0;
 };
 
 #endif  // CHROME_BROWSER_METADATA_PARSER_FACTORY_H_