RFR: 8287263: java/nio/channels/FileChannel/LargeMapTest.java times out on Windows

[Brian Burkhalter]

Double the timeout to avoid spurious failures.

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Commit messages:
 - 8287263: java/nio/channels/FileChannel/LargeMapTest.java times out on Windows

Changes: https://git.openjdk.java.net/jdk/pull/8875/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8875&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287263
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8875.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8875/head:pull/8875

PR: https://git.openjdk.java.net/jdk/pull/8875