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This reverts commit e2f3b551.

Reason for revert:

Breaks local user flow when entering chrome_sdk

ERROR at //build/config/chromeos/rules.gni:180:11: Undefined identifier.
          _symlink_targets[2],
          ^-----------------
See //chromeos/BUILD.gn:239:3: whence it was called.
  generate_runner_script("cros_test_wrapper") {
  ^--------------------------------------------
See //BUILD.gn:442:7: which caused the file to be included.
      "//chromeos:chromeos_unittests",

Original change's description:
> Lacros: create lacros tast test targets
>
> This CL creates gn targets for lacros tast tests, and the main
> motivation is to run lacros tast tests on Chromium CI.
>
> Bug: 1158590
> Change-Id: I783779c3386a39743b8227367189b0b87832b9dc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606188
> Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: Dirk Pranke <dpranke@google.com>
> Cr-Commit-Position: refs/heads/master@{#844127}

TBR=dpranke@google.com,liaoyuke@chromium.org,bpastene@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: I1e51bf2e6aa97bfc40beba7d2693b68361cab2bc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1158590
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2633782Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844180}