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This code was necessary to avoid forcing a remote client to be visible
until occlusion tracking was enabled. Now that mash is no more, there are no
remote clients and this can be removed.

BUG=961763
TEST=none

Change-Id: I05d9603b82a14a1b394287540747e6b84269cb28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635292
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665553}