Revert "Fix a ton of compiler warnings."

chrome/browser/parsers/metadata_parser.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_H_
 #define CHROME_BROWSER_METADATA_PARSER_H_
 
 #include <string>
 
 #include "base/file_path.h"
 
 // Allows for Iteration on the Properties of a given file.
 class MetadataPropertyIterator {
  public:
   MetadataPropertyIterator() {}
-  virtual ~MetadataPropertyIterator() {}
 
   // Gets the next Property in the iterator.  Returns false if at the end
   // of the list.
   virtual bool GetNext(std::string* key, std::string* value) = 0;
 
   // Gets the number of Properties in this iterator.
   virtual int Length() = 0;
 
   // Checks to see if we're at the end of the list.
   virtual bool IsEnd() = 0;
 };
 
 // Represents a single instance of parsing on a particular file.
 class MetadataParser {
  public:
   MetadataParser(const FilePath& path) {}
-  virtual ~MetadataParser() {}
 
   static const char* kPropertyType;
   static const char* kPropertyFilesize;
   static const char* kPropertyTitle;
 
   // Does all the heavy work of parsing out the file. Blocking until complete.
   virtual bool Parse() = 0;
 
   // Gets a particular property found in a parse call.
   virtual bool GetProperty(const std::string& key, std::string* value) = 0;
 
   // Gets an interator allowing you to iterate over all the properties found
   // in a parse call.
   virtual MetadataPropertyIterator* GetPropertyIterator() = 0;
 };
 
 #endif  // CHROME_BROWSER-METADATA_PARSER_H_