ASSERT_NOT_REACHED() reached in AXLogger::log()

https://bugs.webkit.org/show_bug.cgi?id=259971

Reviewed by Jonathan Bedard.

`WeakHashMap<Element, String, WeakPtrImplWithEventTargetData>` was added
as a variant type in 266406@main. At the same commit it was handled in
`WTF::switchOn()` but then was (probably accedently) removed in 266706@main

* Source/WebCore/accessibility/AXLogger.cpp:
(WebCore::AXLogger::log):

Canonical link: https://commits.webkit.org/266730@main

Source/WebCore/accessibility/AXLogger.cpp

@@ -205,6 +205,7 @@ void AXLogger::log(const String& collectionName, const AXObjectCache::DeferredCo
         [&size] (const WeakHashSet<HTMLTableElement, WeakPtrImplWithEventTargetData>& typedCollection) { size = typedCollection.computeSize(); },
         [&size] (const WeakHashSet<AccessibilityTable>& typedCollection) { size = typedCollection.computeSize(); },
         [&size] (const WeakListHashSet<Node, WeakPtrImplWithEventTargetData>& typedCollection) { size = typedCollection.computeSize(); },
+        [&size] (const WeakHashMap<Element, String, WeakPtrImplWithEventTargetData>& typedCollection) { size = typedCollection.computeSize(); },
         [] (auto&) {
             ASSERT_NOT_REACHED();
             return;