getContents() returns AreaGeometry instead of Rectangle2D

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP_0-20-0_Alt-Design@197829 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/area/AreaFrame.java

@@ -125,7 +125,7 @@ public class AreaFrame extends AreaGeometry {
         this.contents = contents;
     }
 
-    public Rectangle2D getContents() {
+    public AreaGeometry getContents() {
         return contents;
     }