Use Revision::isCurrent() in ApiParse.

We have a loaded Revision object so we may use that
method as well.

Change-Id: Ie8bb871f8874871d7df3111d39ba23a01769cd34

includes/api/ApiParse.php

@@ -91,7 +91,7 @@ class ApiParse extends ApiBase {
 				$popts->enableLimitReport( !$params['disablepp'] );
 
 				// If for some reason the "oldid" is actually the current revision, it may be cached
-				if ( $titleObj->getLatestRevID() === intval( $oldid ) )  {
+				if ( $rev->isCurrent() )  {
 					// May get from/save to parser cache
 					$p_result = $this->getParsedSectionOrText( $pageObj, $popts, $pageid,
 						 isset( $prop['wikitext'] ) ) ;