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Also, disable glib explicitly for headless.

Change-Id: I10c4d46e623b9a5b563067e51ba9daf1646369a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2075084Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744786}