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Previously, chromiumos_builder() ignored the **kwargs argument.

This was a problem in http://crrev.com/c/1923225, when the goma_backend
arg was not being passed to builder(). This resulted in some builders
not actually getting the arg to use Goma RBE backend:
- linux-chromeos-dbg
- linux-chromeos-rel

With this CL, these builders will get the correct goma_backend setting,
and start building using the Goma RBE backend.

Bug: 950413
Change-Id: Ie389646206ec96e39f1ad436db341ef213b539c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1924182
Commit-Queue: Simon Que <sque@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716897}