* DatabaseBase::errorCount() was removed (unused).
* $wgDeferredUpdateList was removed.
* DeferredUpdates::addHTMLCacheUpdate() was removed.
-* DatabaseBase::resultObject() is now protected (use outside Database classes
- not necessary since 1.11).
-* Calling ResourceLoaderFileModule::readStyleFiles() without a
- ResourceLoaderContext instance is deprecated.
-* ResourceLoader::getLessCompiler() now takes an optional parameter of
- additional LESS variables to set for the compiler.
== Compatibility ==