Revert r33725, r33726 (hook in Sanitizer::fixTagAttributes()).

Revert r33725, r33726 (hook in Sanitizer::fixTagAttributes()).
This hook is just plain weird.
* Return value on abort destroys the entire data set
* Whitespace is bad
* It's very unclear what this would be used for
* This is a low-level function that's going to get called very often, and the hook is in a place that has little clear function. It's unclear what a general hook would want to do with it.