Cleanup "NewEra" comment after implementing new Japanese Era

This comment has been removed in the upstream commit
http://hg.openjdk.java.net/jdk/jdk/rev/3d8934bf505a#l15.25 and should
have also been removed in http://r.android.com/940636, but we missed
that during merging.

Bug: 77858319
Test: m droid
Change-Id: Ifa1b08e72328aaefd48a615a445e2331e9407d5f
1 file changed