Merge "HTMLForm: Drop this never-used backwards-compatibility"

diff --combined RELEASE-NOTES-1.32
index 52dbbff,a42da5d..e5f83e5
--- 1/RELEASE-NOTES-1.32
--- 2/RELEASE-NOTES-1.32
+++ b/RELEASE-NOTES-1.32
@@@ -290,18 -290,14 +290,21 @@@ because of Phabricator reports
    Define $wgProfiler via LocalSettings.php instead.
  * The mw.loader.addSource() is now considered a private method, and no longer
    supports the `id, url` signature. Use the `Object` parameter instead.
+ * The backwards-compatibility code in HTMLForm to add a drop-down control to an
+   option that is not set to be a drop-down if the "mw-chosen" class is present,
+   is now removed.
  * Several collations were removed. They were workarounds for bugs in the ICU
    library and they are no longer needed (as of ICU 57.1):
    * 'uppercase-se' (NorthernSamiUppercaseCollation) - use 'uca-se' instead
    * 'xx-uca-et' (CollationEt) - use 'uca-et' instead
    * 'xx-uca-fa' (CollationFa) - use 'uca-fa' instead
 +* The hooks 'SpecialRecentChangesFilters' & 'SpecialWatchlistFilters' deprecated
 +  in 1.23 were removed. Instead, use 'ChangesListSpecialPageStructuredFilters'.
 +  The ChangesListSpecialPage code for these legacy hooks, and their use in
 +  SpecialRecentchanges.php and SpecialWatchlist, was also removed:
 +  * ChangesListSpecialPage->getCustomFilters()
 +  * ChangesListSpecialPage->getFilterGroupDefinitionFromLegacyCustomFilters()
 +  * ChangesListSpecialPage::customFilters
  
  === Deprecations in 1.32 ===
  * HTMLForm::setSubmitProgressive() is deprecated. No need to call it. Submit