Integrated: 8302678: validate_source fails after JDK-8293313

[Daniel D. Daugherty]

A trivial copyright header fix.

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Commit messages:
 - 8302678: validate_source fails after JDK-8293313

Changes: https://git.openjdk.org/jdk/pull/12599/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12599&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302678
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/12599.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12599/head:pull/12599

PR: https://git.openjdk.org/jdk/pull/12599