Drop global function wfConfiguredReadOnlyReason, deprecated in 1.36

No uses known in code search.

Bug: T264979
Change-Id: Ifcc375333fb5b1e46b9198462d67d34673b92e5f

RELEASE-NOTES-1.37

@@ -208,6 +208,7 @@ because of Phabricator reports.
 * The following global methods, each deprecated since 1.36, have been removed:
   - wfAppendToArrayIfNotDefault
   - wfAcceptToPrefs
+  - wfConfiguredReadOnlyReason
   - wfDebugMem
 * –
 

includes/GlobalFunctions.php

@@ -1114,19 +1114,6 @@ function wfReadOnlyReason() {
 		->getReason();
 }
 
-/**
- * Get the value of $wgReadOnly or the contents of $wgReadOnlyFile.
- *
- * @return string|bool String when in read-only mode; false otherwise
- * @since 1.27
- * @deprecated since 1.36
- */
-function wfConfiguredReadOnlyReason() {
-	wfDeprecated( __FUNCTION__, '1.36' );
-	return MediaWikiServices::getInstance()->getConfiguredReadOnlyMode()
-		->getReason();
-}
-
 /**
  * Return a Language object from $langcode
  *