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This reverts commit 8e917b47.

Reason for revert: Causing presubmit failure with messages about the chromium.gpu waterfall configuration.
Example: https://ci.chromium.org/p/chromium/builders/try/chromium_presubmit/691375

Original change's description:
> [code coverage] Bot definitions for Windows coverage tryjob
> 
> Add definitions for tester machines for Windows coverage.
> 
> Add buildbot definitions so the tryjob can run tests.
> 
> Bug: 1033753
> Change-Id: I3d933b1beaedd24ad206c9e5d2528ed5e4496b67
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1972753
> Reviewed-by: Nodir Turakulov <nodir@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
> Commit-Queue: Sajjad Mirza <sajjadm@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#726609}

TBR=ynovikov@chromium.org,agable@chromium.org,kbr@chromium.org,nodir@chromium.org,liaoyuke@chromium.org,jbudorick@chromium.org,sajjadm@chromium.org

Change-Id: Ib343ed787d0324d1eaf796fe2ee9ca2742d1cdc4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1033753
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1976145Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726647}