Make courgette_unittests run on swarming in GN.
Make courgette_unittests run on swarming in GN.

BUG=498033
TBR=dpranke

Review URL: https://codereview.chromium.org/1685403002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#374856}

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