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

Source/core/fileapi/Blob.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 46 matching lines @@
         return new Blob(BlobDataHandle::create());
     }
 
     static Blob* create(const HeapVector<ArrayBufferOrArrayBufferViewOrBlobOrString>&, const BlobPropertyBag&, ExceptionState&);
 
     static Blob* create(PassRefPtr<BlobDataHandle> blobDataHandle)
     {
         return new Blob(blobDataHandle);
     }
 
-    virtual ~Blob();
+    ~Blob() override;
 
     virtual unsigned long long size() const { return m_blobDataHandle->size(); }
     virtual Blob* slice(long long start, long long end, const String& contentType, ExceptionState&) const;
 
     // To allow ExceptionState to be passed in last, manually enumerate the optional argument overloads.
     Blob* slice(ExceptionState& exceptionState) const
     {
         return slice(0, std::numeric_limits<long long>::max(), String(), exceptionState);
     }
     Blob* slice(long long start, ExceptionState& exceptionState) const
@@ skipping 13 matching lines @@
     // True for all File instances, including the user-built ones.
     virtual bool isFile() const { return false; }
     // Only true for File instances that are backed by platform files.
     virtual bool hasBackingFile() const { return false; }
     bool hasBeenClosed() const { return m_hasBeenClosed; }
 
     // Used by the JavaScript Blob and File constructors.
     virtual void appendTo(BlobData&) const;
 
     // URLRegistrable to support PublicURLs.
-    virtual URLRegistry& registry() const override final;
+    URLRegistry& registry() const final;
 
     DEFINE_INLINE_TRACE() { }
 
 protected:
     explicit Blob(PassRefPtr<BlobDataHandle>);
 
     template<typename ItemType>
     static void populateBlobData(BlobData* blobData, const HeapVector<ItemType>& parts, bool normalizeLineEndingsToNative)
     {
         for (size_t i = 0; i < parts.size(); ++i) {
@@ skipping 18 matching lines @@
 private:
     Blob();
 
     RefPtr<BlobDataHandle> m_blobDataHandle;
     bool m_hasBeenClosed;
 };
 
 } // namespace blink
 
 #endif // Blob_h