We have a WKTextChecker in the WebKit2 C API that's only used by GTK (and previously EFL). It's really weird to have GTK-specific stuff in the low-level C API. Looks like we should be able to remove it and replace it with use of WebTextChecker instead.
If it's not used by WTR it should be removed.
It is used by WKR in TestController.cpp. I guess we're stuck with it, then, since WKR can't see WK2 internals?
WTR has always used the C API