Add the "virtual" keyword on method overrides that are missing it.

webkit/glue/plugins/pepper_directory_reader.h

 // Copyright (c) 2010 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 WEBKIT_GLUE_PLUGINS_PEPPER_DIRECTORY_READER_H_
 #define WEBKIT_GLUE_PLUGINS_PEPPER_DIRECTORY_READER_H_
 
 #include <queue>
 
 #include "base/file_util_proxy.h"
@@ skipping 10 matching lines @@
 class DirectoryReader : public Resource {
  public:
   explicit DirectoryReader(FileRef* directory_ref);
   virtual ~DirectoryReader();
 
   // Returns a pointer to the interface implementing PPB_DirectoryReader that
   // is exposed to the plugin.
   static const PPB_DirectoryReader_Dev* GetInterface();
 
   // Resource overrides.
-  DirectoryReader* AsDirectoryReader() { return this; }
+  virtual DirectoryReader* AsDirectoryReader();
 
   // PPB_DirectoryReader implementation.
   int32_t GetNextEntry(PP_DirectoryEntry_Dev* entry,
                        PP_CompletionCallback callback);
 
   void AddNewEntries(const std::vector<base::FileUtilProxy::Entry>& entries,
                      bool has_more);
 
  private:
   bool FillUpEntry();
 
   scoped_refptr<FileRef> directory_ref_;
   std::queue<base::FileUtilProxy::Entry> entries_;
   bool has_more_;
   PP_DirectoryEntry_Dev* entry_;
 };
 
 }  // namespace pepper
 
 #endif  // WEBKIT_GLUE_PLUGINS_PEPPER_DIRECTORY_READER_H_