Introduce isHTMLTitleElement and toHTMLTitleElement

Source/core/html/HTMLTitleElement.h

Index: Source/core/html/HTMLTitleElement.h
diff --git a/Source/core/html/HTMLTitleElement.h b/Source/core/html/HTMLTitleElement.h
index b80f598a67347dde62641243e50a8501c0b92cc1..330b66e77e5bbb7744a89642cbf87693bd6632cf 100644
--- a/Source/core/html/HTMLTitleElement.h
+++ b/Source/core/html/HTMLTitleElement.h
@@ -46,6 +46,22 @@ private:
     StringWithDirection m_title;
 };
 
+inline bool isHTMLTitleElement(const Node* node)
+{
+    return node->hasTagName(HTMLNames::titleTag);
+}
+
+inline bool isHTMLTitleElement(const Element* element)

[eseidel, 2013/07/11 01:24:00]

This one shouldn't be necessary, or?

[kangil_, 2013/07/11 01:34:34]

Node::hasTagName includes Node::isElementNode and this is unnecessary trigger
for Element. So, IMHO, we need this. :)

+{
+    return element->hasTagName(HTMLNames::titleTag);
+}
+
+inline HTMLTitleElement* toHTMLTitleElement(Node* node)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLTitleElement(node));
+    return static_cast<HTMLTitleElement*>(node);
+}
+
 } //namespace
 
 #endif