Fix virtual/override/final usage in the rest of Source/core/.

Source/core/fileapi/Blob.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 @@
 #include "core/fileapi/BlobPropertyBag.h"
 #include "platform/blob/BlobRegistry.h"
 #include "platform/blob/BlobURL.h"
 
 namespace blink {
 
 namespace {
 
 class BlobURLRegistry final : public URLRegistry {
 public:
-    virtual void registerURL(SecurityOrigin*, const KURL&, URLRegistrable*) override;
-    virtual void unregisterURL(const KURL&) override;
+    void registerURL(SecurityOrigin*, const KURL&, URLRegistrable*) override;
+    void unregisterURL(const KURL&) override;
 
     static URLRegistry& registry();
 };
 
 void BlobURLRegistry::registerURL(SecurityOrigin* origin, const KURL& publicURL, URLRegistrable* registrableObject)
 {
     ASSERT(&registrableObject->registry() == this);
     Blob* blob = static_cast<Blob*>(registrableObject);
     BlobRegistry::registerPublicBlobURL(origin, publicURL, blob->blobDataHandle());
 }
@@ skipping 113 matching lines @@
 {
     blobData.appendBlob(m_blobDataHandle, 0, m_blobDataHandle->size());
 }
 
 URLRegistry& Blob::registry() const
 {
     return BlobURLRegistry::registry();
 }
 
 } // namespace blink