Input type file should return ButtonRole.

Source/modules/accessibility/AXRenderObject.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
@@ skipping 64 matching lines @@
     // Overridden from AXObject.
     //
 
     virtual void init() override;
     virtual void detach() override;
     virtual bool isDetached() const override { return !m_renderer; }
     virtual bool isAXRenderObject() const override { return true; }
 
     // Check object role or purpose.
     virtual bool isAttachment() const override;
-    virtual bool isFileUploadButton() const override;
     virtual bool isLinked() const override;
     virtual bool isLoaded() const override;
     virtual bool isOffScreen() const override;
     virtual bool isReadOnly() const override;
     virtual bool isVisited() const override;
 
     // Check object state.
     virtual bool isFocused() const override;
     virtual bool isSelected() const override;
 
@@ skipping 123 matching lines @@
     VisibleSelection selection() const;
     int indexForVisiblePosition(const VisiblePosition&) const;
     void accessibilityChildrenFromAttribute(QualifiedName attr, AccessibilityChildrenVector&) const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXRenderObject, isAXRenderObject());
 
 } // namespace blink
 
 #endif // AXRenderObject_h