Revert of Add template parameter to ElementTraversal to iterate over Elements of a specific type

Source/core/dom/Element.h

Index: Source/core/dom/Element.h
diff --git a/Source/core/dom/Element.h b/Source/core/dom/Element.h
index 77d70e063c1948a9a1466e6386ec66babaaa73e6..6db11f9558b94d9bbed6a02d1b81a55b338f8c0f 100644
--- a/Source/core/dom/Element.h
+++ b/Source/core/dom/Element.h
@@ -673,29 +673,6 @@
 template <typename T> inline bool isElementOfType(const Node& node) { return node.isElementNode() && isElementOfType<const T>(toElement(node)); }
 template <> inline bool isElementOfType<const Element>(const Element&) { return true; }
 
-// Type casting.
-template<typename T> inline T& toElement(Node& node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(isElementOfType<const T>(node));
-    return static_cast<T&>(node);
-}
-template<typename T> inline T* toElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || isElementOfType<const T>(*node));
-    return static_cast<T*>(node);
-}
-template<typename T> inline const T& toElement(const Node& node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(isElementOfType<const T>(node));
-    return static_cast<const T&>(node);
-}
-template<typename T> inline const T* toElement(const Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || isElementOfType<const T>(*node));
-    return static_cast<const T*>(node);
-}
-template<typename T, typename U> inline T* toElement(const RefPtr<U>& node) { return toElement<T>(node.get()); }
-
 inline bool isDisabledFormControl(const Node* node)
 {
     return node->isElementNode() && toElement(node)->isDisabledFormControl();