RFR: 8261209: isStandalone property: remove dependency on pretty-print

[Joe Wang]

A quick fix to remove isStandalone's dependency on pretty-print.

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Commit messages:
 - 8261209: isStandalone property: remove dependency on pretty-print

Changes: https://git.openjdk.java.net/jdk/pull/2442/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2442&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261209
  Stats: 36 lines in 3 files changed: 18 ins; 2 del; 16 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2442.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2442/head:pull/2442

PR: https://git.openjdk.java.net/jdk/pull/2442