Integrated: 8261234: Lanai build fails due to leftover import of JavaNativeFoundation.h

[Kevin Rushforth]

Fix build by removing the last two now-obsolete import statements for `JavaNativeFoundation.h`.

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Commit messages:
 - 8261234: Lanai build fails due to leftover import of JavaNativeFoundation.h

Changes: https://git.openjdk.java.net/lanai/pull/174/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=174&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261234
  Stats: 3 lines in 2 files changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/lanai/pull/174.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/174/head:pull/174

PR: https://git.openjdk.java.net/lanai/pull/174