RFR: JDK-8280019: Remove unused code from metaspace

[Thomas Stuefe]

Sonarcloud-inspired code grooming. Trivial removal of unused code in metaspace.

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Commit messages:
 - remove unused code

Changes: https://git.openjdk.java.net/jdk/pull/7085/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7085&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280019
  Stats: 20 lines in 7 files changed: 0 ins; 20 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7085.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7085/head:pull/7085

PR: https://git.openjdk.java.net/jdk/pull/7085