RFR: JDK-8263438: Unused method AbstractMemberWriter.isInherited

[Hannes Wallnöfer]

Trivial change to remove unused method.

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Commit messages:
 - JDK-8263438: Unused method AbstractMemberWriter.isInherited

Changes: https://git.openjdk.java.net/jdk/pull/4049/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4049&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263438
  Stats: 14 lines in 1 file changed: 0 ins; 14 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4049.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4049/head:pull/4049

PR: https://git.openjdk.java.net/jdk/pull/4049