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

Source/core/fileapi/File.h

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 94 matching lines @@
 
     static File* createForFileSystemFile(const String& path, const String& name, ContentTypeLookupPolicy policy = WellKnownContentTypes)
     {
         if (name.isEmpty())
             return new File(path, policy, File::IsNotUserVisible);
         return new File(path, name, policy, File::IsNotUserVisible);
     }
 
     File* clone(const String& name = String()) const;
 
-    virtual unsigned long long size() const override;
-    virtual Blob* slice(long long start, long long end, const String& contentType, ExceptionState&) const override;
-    virtual void close(ExecutionContext*, ExceptionState&) override;
+    unsigned long long size() const override;
+    Blob* slice(long long start, long long end, const String& contentType, ExceptionState&) const override;
+    void close(ExecutionContext*, ExceptionState&) override;
 
-    virtual bool isFile() const override { return true; }
-    virtual bool hasBackingFile() const override { return m_hasBackingFile; }
+    bool isFile() const override { return true; }
+    bool hasBackingFile() const override { return m_hasBackingFile; }
 
-    virtual void appendTo(BlobData&) const override;
+    void appendTo(BlobData&) const override;
 
     const String& path() const { ASSERT(hasValidFilePath()); return m_path; }
     const String name() const { return m_name; }
 
     // Getter for the lastModified IDL attribute,
     // http://dev.w3.org/2006/webapi/FileAPI/#file-attrs
     long long lastModified() const;
 
     // Getter for the lastModifiedDate IDL attribute,
     // http://www.w3.org/TR/FileAPI/#dfn-lastModifiedDate
@@ skipping 48 matching lines @@
     const double m_snapshotModificationTimeMS;
 
     String m_relativePath;
 };
 
 DEFINE_TYPE_CASTS(File, Blob, blob, blob->isFile(), blob.isFile());
 
 } // namespace blink
 
 #endif // File_h