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It could happen that the dialog window is closed because the parent
window was closed (e.g. Ctrl+C on Chrome running on terminal). In that
case, the parent X11Window object doesn't exist any more, and calling
it would cause a segfault.

Bug: 1104585
Change-Id: I3aee31c5fa9e567f55e0317d9df8c675502ff990
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2300094Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Nick Yamane <nickdiego@igalia.com>
Commit-Queue: Jacobo Aragunde Pérez <jaragunde@igalia.com>
Cr-Commit-Position: refs/heads/master@{#789436}