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..b6431e740d79b1172ac23efa18d2fcb8eaf4ceca 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 (isImageButton() && name == srcAttr) || HTMLTextFormControlElement::hasLegalLinkAttribute(name);

[tkent, 2014/03/18 01:23:31]

We don't want to add new input-type check code in HTMLInputElement. We should
introduce InputType::hasLegalLinkAttribute, and ImageInputType should override
it.

FIXME comment or another CL is acceptable for this.

[Inactive, 2014/03/18 02:10:22]

I added the InputType::hasLegalLinkAttribute() virtual function to this CL.
PTAL.

+}
+
 const AtomicString& HTMLInputElement::defaultValue() const
 {
     return fastGetAttribute(valueAttr);