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The UseTestConfigForPlatformWindows wasn't in use for use_x11
case since https://crrev.com/c/822989 when window_tree_host_x11
was removed and UseTestConfigForPlatformWindows was moved to
x11_window_base, which wasn't in use by use_x11.

Also, this setting affects X11TopmostWindowFinder tests when
they are enabled for Ozone/X11. The way how it affects them
is that they simply fail to run and result in incorrect
test expectations. It looks like this flag intercepts some events
such as map and others...

So, given that it's not used for use_x11 case, just leave that
for ChromeOS as it has always been used by that (my judgement
is based on https://codereview.chromium.org/2683033006) and remove
that for another case, which is Linux.

Bug: 789065
Change-Id: Ib30a3ec7b4352b91da63582027e17ac6ce5c05c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372385
Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801075}