DatabaseBlock: Remove deprecated isValid method

Change-Id: I5f54426207f31f6acaceb8f21d43ddb2227d58cc

RELEASE-NOTES-1.35

@@ -490,6 +490,7 @@ because of Phabricator reports.
   This was deprecated in 1.25.
 * The ArticleAfterFetchContentObject hook, deprecated in 1.32, was removed.
   Use ArticleRevisionViewCustom to control output.
+* DatabaseBlock::isValid, deprecated in 1.33, was removed.
 * HTMLUserTextField and HTMLUsersMultiselectField previously implied
   required=true when exists=true. Form fields that use exists=true should also
   set required=true if they are required.

includes/block/DatabaseBlock.php

@@ -933,17 +933,6 @@ class DatabaseBlock extends AbstractBlock {
 		}
 	}
 
-	/**
-	 * Is the block address valid (i.e. not a null string?)
-	 *
-	 * @deprecated since 1.33 No longer needed in core.
-	 * @return bool
-	 */
-	public function isValid() {
-		wfDeprecated( __METHOD__, '1.33' );
-		return $this->getTarget() != null;
-	}
-
 	/**
 	 * Update the timestamp on autoblocks.
 	 */