Hard-deprecate Title::getCdnUrls

Depends-On: Ib709a6f7d9d89f3906c5578d25d9036fd326f1c5
Change-Id: I7be53aa758761292a1544bd8273575c7c240abc9

RELEASE-NOTES-1.42

@@ -534,6 +534,7 @@ because of Phabricator reports.
 * TempUserConfig::getMatchPattern has been deprecated, use
   TempUserConfig::getMatchPatterns instead.
 * (T230025) Title::purgeSquid(), deprecated in 1.35, now emits warnings.
+* Title::getCdnUrls(), deprecated in 1.35, now emits warnings.
 * The rarely-used convenience method Xml::wrapClass() is now deprecated. Instead
   you can use Xml::tags('span', ['class'=>'foo'], 'bar').
 * $wgUseSameSiteLegacyCookies has been deprecated and will be ignored.

includes/title/Title.php

@@ -2929,10 +2929,11 @@ class Title implements LinkTarget, PageIdentity, IDBAccessObject {
 	/**
 	 * Get a list of URLs to purge from the CDN cache when this page changes.
 	 *
-	 * @deprecated since 1.35 Use HtmlCacheUpdater
+	 * @deprecated since 1.35 Use HtmlCacheUpdater; hard-deprecated in 1.42
 	 * @return string[]
 	 */
 	public function getCdnUrls() {
+		wfDeprecated( __METHOD__, '1.35' );
 		$htmlCache = MediaWikiServices::getInstance()->getHtmlCacheUpdater();
 		return $htmlCache->getUrls( $this );
 	}

tests/phpunit/includes/title/TitleTest.php

@@ -1841,6 +1841,7 @@ class TitleTest extends MediaWikiIntegrationTestCase {
 	 * @covers MediaWiki\Title\Title::getCdnUrls
 	 */
 	public function testGetCdnUrls() {
+		$this->hideDeprecated( Title::class . '::getCdnUrls' );
 		$this->assertEquals(
 			[
 				'https://example.org/wiki/Example',