Replace elementHasLegalLinkAttribute() helper with virtual function

Source/core/html/HTMLInputElement.cpp

Index: Source/core/html/HTMLInputElement.cpp
diff --git a/Source/core/html/HTMLInputElement.cpp b/Source/core/html/HTMLInputElement.cpp
index fade032976a20259bbd6ba58d8e284a9749f0595..d57c93a38929315862ae4451f62c97aafea7c853 100644
--- a/Source/core/html/HTMLInputElement.cpp
+++ b/Source/core/html/HTMLInputElement.cpp
@@ -1206,6 +1206,11 @@ bool HTMLInputElement::isURLAttribute(const Attribute& attribute) const
     return attribute.name() == srcAttr || attribute.name() == formactionAttr || HTMLTextFormControlElement::isURLAttribute(attribute);
 }
 
+bool HTMLInputElement::hasLegalLinkAttribute(const QualifiedName& name) const
+{
+    return m_inputType->hasLegalLinkAttribute(name) || HTMLTextFormControlElement::hasLegalLinkAttribute(name);
+}
+
 const AtomicString& HTMLInputElement::defaultValue() const
 {
     return fastGetAttribute(valueAttr);