Revert of Use Shadow DOM to display fallback content for images

Source/core/html/forms/ImageInputType.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Samsung Electronics. 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
@@ skipping 23 matching lines @@
 #define ImageInputType_h
 
 #include "core/html/forms/BaseButtonInputType.h"
 #include "platform/geometry/IntPoint.h"
 
 namespace blink {
 
 class ImageInputType final : public BaseButtonInputType {
 public:
     static PassRefPtrWillBeRawPtr<InputType> create(HTMLInputElement&);
-    virtual PassRefPtr<RenderStyle> customStyleForRenderer(PassRefPtr<RenderStyle>);
 
 private:
     ImageInputType(HTMLInputElement&);
     virtual const AtomicString& formControlType() const override;
     virtual bool isFormDataAppendable() const override;
     virtual bool appendFormData(FormDataList&, bool) const override;
     virtual String resultForDialogSubmit() const override;
     virtual bool supportsValidation() const override;
     virtual RenderObject* createRenderer(RenderStyle*) const override;
     virtual void handleDOMActivateEvent(Event*) override;
     virtual void altAttributeChanged() override;
     virtual void srcAttributeChanged() override;
-    virtual void valueAttributeChanged() override;
     virtual void startResourceLoading() override;
     virtual bool shouldRespectAlignAttribute() override;
     virtual bool canBeSuccessfulSubmitButton() override;
     virtual bool isEnumeratable() override;
     virtual bool shouldRespectHeightAndWidthAttributes() override;
     virtual unsigned height() const override;
     virtual unsigned width() const override;
     virtual bool hasLegalLinkAttribute(const QualifiedName&) const override;
     virtual const QualifiedName& subResourceAttributeName() const override;
-    virtual void ensureFallbackContent() override;
-    virtual void ensurePrimaryContent() override;
-    virtual void createShadowSubtree() override;
-
-    void reattachFallbackContent();
-    void setUseFallbackContent();
 
     IntPoint m_clickLocation; // Valid only during HTMLFormElement::prepareForSubmission().
-    bool m_useFallbackContent;
 };
 
 } // namespace blink
 
 #endif // ImageInputType_h