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There is no clean way to shut down GLX, so it's best to fail GPU
process launch. In GpuProcessHost::DidFailInitialize(), we will
fallback to the next mode, which is SwiftShader, right away.

BUG=971169
TEST=manual
R=piman@chromium.org

Change-Id: I615c2a9a956b081f48dbbfa1d7ba4768dd363f4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1707986
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678944}