Index: trunk/src/org/openstreetmap/josm/data/Preferences.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/Preferences.java	(revision 13546)
+++ trunk/src/org/openstreetmap/josm/data/Preferences.java	(revision 13548)
@@ -27,5 +27,4 @@
 import java.util.concurrent.TimeUnit;
 import java.util.function.Predicate;
-import java.util.regex.Pattern;
 import java.util.stream.Stream;
 
@@ -76,11 +75,5 @@
 public class Preferences extends AbstractPreferences {
 
-    private static final String COLOR_PREFIX = "color.";
-    private static final Pattern COLOR_LAYER_PATTERN = Pattern.compile("layer\\.(.+)");
-    private static final Pattern COLOR_MAPPAINT_PATTERN = Pattern.compile("mappaint\\.(.+?)\\.(.+)");
-
     private static final String[] OBSOLETE_PREF_KEYS = {
-      "projection", /* remove entry after Nov. 2017 */
-      "projection.sub", /* remove entry after Nov. 2017 */
     };