RFR: 8275241: Unused ArrayList is created in RequestEngine.addHooks

[Andrey Turbanov]

Local `ArrayList<RequestHook>`  is created in a method `RequestEngine.addHooks`. Elements are added to it, but then content is unused. Seems leftovers from some refactoring.
Found by IntelliJ IDEA inspection "Mismatched query and update of collection"

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Commit messages:
 - [PATCH] Unused ArrayList is created in RequestEngine.addHooks

Changes: https://git.openjdk.java.net/jdk/pull/5629/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5629&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275241
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5629.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5629/head:pull/5629

PR: https://git.openjdk.java.net/jdk/pull/5629