* Skin::linkKnown() (use MediaWiki\Linker\LinkRenderer instead)
* Skin::userLink() (use Linker::userLink() instead)
* Skin::userToolLinks() (use Linker::userToolLinks() instead)
-* The 'ParserLimitReportFormat' hook was removed.
* Disabled "bug 2702" HTML tidying of parsed UI messages on wikis where Tidy is
disabled.
* DifferenceEngine::generateDiffBody() was removed (deprecated since 1.21).