Remove comments about OpenJDK bug 100167

These days, since we have the diamond operator, we tend to prefer using
native constructors instead of the Guava variants anyway, so we are not
especially tempted to write Maps.newTreeMap. And it's quite likely that
OpenJDK 8 doesn't have this bug anymore anyway (but it's actually hard
to tell because I can't find this bug on their bug tracker, only the
Guava reference at https://github.com/google/guava/issues/635).

Change-Id: Ia93a5aff30c8a30caa0119c2a592b792e3ef147e

gerrit-server/src/main/java/com/google/gerrit/server/change/ChangeJson.java

@@ -714,7 +714,6 @@ public class ChangeJson {
 
   private Map<String, LabelWithStatus> initLabels(
       ChangeData cd, LabelTypes labelTypes, boolean standard) throws OrmException {
-    // Don't use Maps.newTreeMap(Comparator) due to OpenJDK bug 100167.
     Map<String, LabelWithStatus> labels = new TreeMap<>(labelTypes.nameComparator());
     for (SubmitRecord rec : submitRecords(cd)) {
       if (rec.labels == null) {

gerrit-server/src/main/java/com/google/gerrit/server/change/ReviewerJson.java

@@ -123,7 +123,6 @@ public class ReviewerJson {
       throws OrmException, PermissionBackendException {
     LabelTypes labelTypes = cd.getLabelTypes();
 
-    // Don't use Maps.newTreeMap(Comparator) due to OpenJDK bug 100167.
     out.approvals = new TreeMap<>(labelTypes.nameComparator());
     for (PatchSetApproval ca : approvals) {
       for (PermissionRange pr : cd.changeControl().getLabelRanges()) {