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

Source/core/fileapi/FileReader.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 38 matching lines @@
 class ExecutionContext;
 class StringOrArrayBuffer;
 
 class CORE_EXPORT FileReader final : public RefCountedGarbageCollectedEventTargetWithInlineData<FileReader>, public ActiveDOMObject, public FileReaderLoaderClient {
     DEFINE_WRAPPERTYPEINFO();
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(FileReader);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(FileReader);
 public:
     static FileReader* create(ExecutionContext*);
 
-    virtual ~FileReader();
+    ~FileReader() override;
 
     enum ReadyState {
         EMPTY = 0,
         LOADING = 1,
         DONE = 2
     };
 
     void readAsArrayBuffer(Blob*, ExceptionState&);
     void readAsBinaryString(Blob*, ExceptionState&);
     void readAsText(Blob*, const String& encoding, ExceptionState&);
     void readAsText(Blob*, ExceptionState&);
     void readAsDataURL(Blob*, ExceptionState&);
     void abort();
 
     void doAbort();
 
     ReadyState readyState() const { return m_state; }
     FileError* error() { return m_error; }
     void result(StringOrArrayBuffer& resultAttribute) const;
 
     // ActiveDOMObject
-    virtual void stop() override;
-    virtual bool hasPendingActivity() const override;
+    void stop() override;
+    bool hasPendingActivity() const override;
 
     // EventTarget
-    virtual const AtomicString& interfaceName() const override;
-    virtual ExecutionContext* executionContext() const override { return ActiveDOMObject::executionContext(); }
+    const AtomicString& interfaceName() const override;
+    ExecutionContext* executionContext() const override { return ActiveDOMObject::executionContext(); }
 
     // FileReaderLoaderClient
-    virtual void didStartLoading() override;
-    virtual void didReceiveData() override;
-    virtual void didFinishLoading() override;
-    virtual void didFail(FileError::ErrorCode) override;
+    void didStartLoading() override;
+    void didReceiveData() override;
+    void didFinishLoading() override;
+    void didFail(FileError::ErrorCode) override;
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(loadstart);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(progress);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(load);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(abort);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(error);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(loadend);
 
     DECLARE_VIRTUAL_TRACE();
 
@@ skipping 27 matching lines @@
 
     OwnPtr<FileReaderLoader> m_loader;
     Member<FileError> m_error;
     double m_lastProgressNotificationTimeMS;
     int m_asyncOperationId;
 };
 
 } // namespace blink
 
 #endif // FileReader_h