Generate isHTML*Element() / toHTML*Element() helper functions

Source/core/html/HTMLObjectElement.h

Index: Source/core/html/HTMLObjectElement.h
diff --git a/Source/core/html/HTMLObjectElement.h b/Source/core/html/HTMLObjectElement.h
index 347ed7993f84c2d830523921f786417f11f132d6..1ca9fd85774ebaeb8114eb16a953b7eed6f4fd53 100644
--- a/Source/core/html/HTMLObjectElement.h
+++ b/Source/core/html/HTMLObjectElement.h
@@ -111,9 +111,13 @@ private:
     bool m_useFallbackContent : 1;
 };
 
-DEFINE_NODE_TYPE_CASTS(HTMLObjectElement, hasTagName(HTMLNames::objectTag));
+// Intentionally left unimplemented, template specialization needs to be provided for specific
+// return types.
+template<typename T> inline const T& toElement(const FormAssociatedElement&);

[Inactive, 2014/02/23 18:27:33]

I made toHTMLObjectElement() accept a FormAssociatedElement as input instead of
a Node.

To do so, we are now overloading
template<typename T> inline const T& toElement(const Node&)
template<typename T> inline const T* toElement(const Node*)

instead of:
const HTMLObjectElement& toHTMLObjectElement(const Node&);
const HTMLObjectElement* toHTMLObjectElement(const Node*);

as toHTMLObjectElement is now a macro calling toElement<HTMLObjectElement>().

+template<typename T> inline const T* toElement(const FormAssociatedElement*);
 
-inline const HTMLObjectElement* toHTMLObjectElement(const FormAssociatedElement* element)
+// Make toHTMLObjectElement() accept a FormAssociatedElement as input instead of a Node.
+template<> inline const HTMLObjectElement* toElement<HTMLObjectElement>(const FormAssociatedElement* element)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!element || !element->isFormControlElement());
     const HTMLObjectElement* objectElement = static_cast<const HTMLObjectElement*>(element);
@@ -123,7 +127,7 @@ inline const HTMLObjectElement* toHTMLObjectElement(const FormAssociatedElement*
     return objectElement;
 }
 
-inline const HTMLObjectElement& toHTMLObjectElement(const FormAssociatedElement& element)
+template<> inline const HTMLObjectElement& toElement<HTMLObjectElement>(const FormAssociatedElement& element)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!element.isFormControlElement());
     const HTMLObjectElement& objectElement = static_cast<const HTMLObjectElement&>(element);