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The X11 code that uses display property change event to detect system busy
doesn't work correctly. In the case of about:gpuhang, it always returns timeout
and the GPU watchdog fails to kill the GPU process. This piece of code is now
deleted and the GPU process is killed and restarted successfully again.

Bug:1001773

Change-Id: I4f7634dd2abd326b34d3d5b687def7e5d421b07d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1794268Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Auto-Submit: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699127}