There are three different ToElement functions in Blink core that accept pointers:

template <typename T>
inline T* ToElement(Node* node);

template <typename T>
inline const T* ToElement(const Node* node);

template <typename T>
inline const T* ToElement(const ListedELement*);

Two of them are in core/dom/Element.h, the last one in core/html/HTMLObjectElement.h.

If code includes both headers and try to use one of the casting/conversion macros you will get a compilation error:

In file included from gen/third_party/WebKit/Source/core/exported/exported_jumbo_1.cc:60:
gen/third_party/WebKit/Source/core/exported/../../../../../../../../third_party/WebKit/Source/core/exported/WebSearchableFormData.cpp:170:24: error: call to 'ToElement' is ambiguous
        text_element = toHTMLInputElement(&control);
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
gen/blink/core/HTMLElementTypeHelpers.h:1898:31: note: expanded from macro 'toHTMLInputElement'
#define toHTMLInputElement(x) blink::ToElement<blink::HTMLInputElement>(x)
                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../third_party/WebKit/Source/core/dom/Element.h:1005:11: note: candidate function [with T = blink::HTMLInputElement]
inline T* ToElement(Node* node) {
          ^
../../third_party/WebKit/Source/core/dom/Element.h:1015:17: note: candidate function [with T = blink::HTMLInputElement]
inline const T* ToElement(const Node* node) {
                ^
../../third_party/WebKit/Source/core/html/HTMLObjectElement.h:131:17: note: candidate function [with T = blink::HTMLInputElement]
inline const T* ToElement(const ListedElement*);

This happens when jumbo compiling core/exported unless you exclude WebSearchableFormData.cpp because it uses macros toHTMLSelectElement and toHTMLInputElement that expands to calls to blink::ToElement and it is used on objects that are both Nodes and ListedElements.

I think ToElement for ListedElement should be renamed but it's a small mess of templates and macros so I don't know how far such a rename would spread.