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Keeping the DRM devices open in the browser process means the kernel
doesn't need to clean up the display state when the GPU process crashes,
eliminating the flicker caused by the kernel disabling the CRTCs on GPU
crashes.

BUG=445773

Review URL: https://codereview.chromium.org/1064453003

Cr-Commit-Position: refs/heads/master@{#327557}