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This reverts commit 57af9203.

After bisecting the changes between the failing and passing pfq runs,
the CL responsible for fixing desktopui_MashLogin was CL:1215947 and
not the revert of "Use minigbm mmap for modeset buffers"

BUG=b:78892556

Change-Id: I07908ca894d9132073c1846277d3e32fa1e7d4a8
Reviewed-on: https://chromium-review.googlesource.com/1235202Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Drew Davenport <ddavenport@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592882}