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Native Java Unittests have all been removed, and so it's time to revert
the infra changes they required.

Reverted:
https://crrev.com/ea65b1a1577f1fbba45e035f43e1c898a9874f9b
https://crrev.com/26dc9eefadac5e70cf3789abbfb1eead7c9f7b68
https://crrev.com/1265cac9f769d0460a84e3f906b93f62290fd117
https://crrev.com/d46596b1702517799459d4b6a9a26669b187c94b
https://crrev.com/04c511fd08177c915d5c267835110d0194bdd671

Bug: 1103344
Change-Id: I12ea68454c118de7860be6ba23c6e8263baceb99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2406692
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807140}