isClearButtonElement  453 Source/core/dom/Element.h     virtual bool isClearButtonElement() const { return false; }
isClearButtonElement   53 Source/core/html/shadow/ClearButtonElement.h     virtual bool isClearButtonElement() const OVERRIDE;
isClearButtonElement   59 Source/core/html/shadow/ClearButtonElement.h DEFINE_TYPE_CASTS(ClearButtonElement, Element, element, element->isClearButtonElement(), element.isClearButtonElement());