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TestSubsurface has a ptr to MockSurface wl_resource which may incur
use-after-free if MockSurface is destroyed first. Do the same thing we
do for MockXdgSurface in MockSurface dtor to avoid it.

Change-Id: Ia63c187485c39033f715f446cc724fcc4043b46a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391388Reviewed-by: Maksim Sisov (GMT+3) <msisov@igalia.com>
Reviewed-by: Takashi Sakamoto <tasak@google.com>
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805289}