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

Source/modules/filesystem/DirectoryReaderSync.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 31 matching lines @@
 
 namespace blink {
 
 class DirectoryReaderSync::EntriesCallbackHelper final : public EntriesCallback {
 public:
     explicit EntriesCallbackHelper(DirectoryReaderSync* reader)
         : m_reader(reader)
     {
     }
 
-    virtual void handleEvent(const EntryHeapVector& entries) override
+    void handleEvent(const EntryHeapVector& entries) override
     {
         EntrySyncHeapVector syncEntries;
         syncEntries.reserveInitialCapacity(entries.size());
         for (size_t i = 0; i < entries.size(); ++i)
             syncEntries.uncheckedAppend(EntrySync::create(entries[i].get()));
         m_reader->addEntries(syncEntries);
     }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_reader);
         EntriesCallback::trace(visitor);
     }
 
 private:
     Member<DirectoryReaderSync> m_reader;
 };
 
 class DirectoryReaderSync::ErrorCallbackHelper final : public ErrorCallback {
 public:
     explicit ErrorCallbackHelper(DirectoryReaderSync* reader)
         : m_reader(reader)
     {
     }
 
-    virtual void handleEvent(FileError* error) override
+    void handleEvent(FileError* error) override
     {
         m_reader->setError(error->code());
     }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_reader);
         ErrorCallback::trace(visitor);
     }
 
@@ skipping 31 matching lines @@
     return result;
 }
 
 DEFINE_TRACE(DirectoryReaderSync)
 {
     visitor->trace(m_entries);
     DirectoryReaderBase::trace(visitor);
 }
 
 } // namespace