[OpenJDK 2D-Dev] RFR: 8271603: Unnecessary Vector usage in java.desktop

[Andrey Turbanov]

Usage of thread-safe collection `Vector` is unnecessary. It's recommended to use `ArrayList` if a thread-safe implementation is not needed. In post-BiasedLocking times, this is gets worse, as every access is synchronized.
I checked only places where `Vector` was used as local variable.

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Commit messages:
 - [PATCH] Unnecessary Vector usage in java.desktop
 - [PATCH] Unnecessary Vector usage in java.desktop

Changes: https://git.openjdk.java.net/jdk/pull/4680/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4680&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271603
  Stats: 51 lines in 5 files changed: 3 ins; 16 del; 32 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4680.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4680/head:pull/4680

PR: https://git.openjdk.java.net/jdk/pull/4680