RFR: 8280719: G1: Remove outdated comment in RemoveSelfForwardPtrObjClosure::apply

[Thomas Schatzl]

Hi all,

  can I have reviews for this trivial change that removes an obsolete comment after JDK-8280374? Zapping does not clear the bitmap any more.

Thanks,
  Thomas

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Commit messages:
 - Remove comment

Changes: https://git.openjdk.java.net/jdk/pull/7234/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7234&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280719
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7234.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7234/head:pull/7234

PR: https://git.openjdk.java.net/jdk/pull/7234