GitLab

There is no need to track and handle window occlusion changes
during shutdown. Disable it to make exit faster.

Bug: 1157976
Change-Id: I52f9e3ea333b0d390cd479f6dfd524935d1dfc4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587650
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836683}