Fix virtual/override/final usage in Source/modules/.

Source/modules/filesystem/DirectoryEntry.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 34 matching lines @@
 class FileSystemFlags;
 class VoidCallback;
 
 class MODULES_EXPORT DirectoryEntry final : public Entry {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static DirectoryEntry* create(DOMFileSystemBase* fileSystem, const String& fullPath)
     {
         return new DirectoryEntry(fileSystem, fullPath);
     }
-    virtual bool isDirectory() const override { return true; }
+    bool isDirectory() const override { return true; }
 
     DirectoryReader* createReader();
     void getFile(const String& path, const FileSystemFlags&, EntryCallback* = nullptr, ErrorCallback* = nullptr);
     void getDirectory(const String& path, const FileSystemFlags&, EntryCallback* = nullptr, ErrorCallback* = nullptr);
     void removeRecursively(VoidCallback* successCallback = nullptr, ErrorCallback* = nullptr) const;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     DirectoryEntry(DOMFileSystemBase*, const String& fullPath);
 };
 
 DEFINE_TYPE_CASTS(DirectoryEntry, Entry, entry, entry->isDirectory(), entry.isDirectory());
 
 } // namespace blink
 
 #endif // DirectoryEntry_h