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

Source/modules/filesystem/DirectoryReader.cpp

 /*
  * 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 27 matching lines @@
 
 namespace blink {
 
 class DirectoryReader::EntriesCallbackHelper final : public EntriesCallback {
 public:
     explicit EntriesCallbackHelper(DirectoryReader* reader)
         : m_reader(reader)
     {
     }
 
-    virtual void handleEvent(const EntryHeapVector& entries) override
+    void handleEvent(const EntryHeapVector& entries) override
     {
         m_reader->addEntries(entries);
     }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_reader);
         EntriesCallback::trace(visitor);
     }
 
 private:
     // FIXME: This Member keeps the reader alive until all of the readDirectory results are received. crbug.com/350285
     Member<DirectoryReader> m_reader;
 };
 
 class DirectoryReader::ErrorCallbackHelper final : public ErrorCallback {
 public:
     explicit ErrorCallbackHelper(DirectoryReader* reader)
         : m_reader(reader)
     {
     }
 
-    virtual void handleEvent(FileError* error) override
+    void handleEvent(FileError* error) override
     {
         m_reader->onError(error);
     }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_reader);
         ErrorCallback::trace(visitor);
     }
 
@@ skipping 64 matching lines @@
 DEFINE_TRACE(DirectoryReader)
 {
     visitor->trace(m_entries);
     visitor->trace(m_error);
     visitor->trace(m_entriesCallback);
     visitor->trace(m_errorCallback);
     DirectoryReaderBase::trace(visitor);
 }
 
 }