RFR: 8274497: Unnecessary Vector usage in AquaFileSystemModel

[Andrey Turbanov]

Fields AquaFileSystemModel.fileCache and AquaFileSystemModel.FilesLoader.queuedTasks are accessed only under synchronized(fileCacheLock).
It means extract synchronization by Vector is not needed.

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Commit messages:
 - [PATCH] Unnecessary Vector usage in AquaFileSystemModel
 - [PATCH] Unnecessary Vector usage in AquaFileSystemModel

Changes: https://git.openjdk.java.net/jdk/pull/5568/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5568&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274497
  Stats: 8 lines in 1 file changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5568.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5568/head:pull/5568

PR: https://git.openjdk.java.net/jdk/pull/5568