RFR: 8328561: test java/awt/Robot/ManualInstructions/ManualInstructions.java isn't used

[Phil Race]

I don't know why this file is checked in. It has no @test tag and doesn't do anything. I am deleting it.

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Commit messages:
 - 8328561

Changes: https://git.openjdk.org/jdk/pull/18440/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18440&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328561
  Stats: 328 lines in 1 file changed: 0 ins; 328 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18440.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18440/head:pull/18440

PR: https://git.openjdk.org/jdk/pull/18440