[ozone/wayland]Handle window destruction during surface configure

ProcessPendingConfigureState() calls RequestStateFromServer(), which
reaches the delegate's OnStateUpdate(). The views layer may
synchronously close the widget and destroy the platform window inside
that callout. The existing weak-ptr guard in
MaybeApplyLatestStateRequest() returns early in that case, but
ProcessPendingConfigureState() then continued to access members after
the call returned.

Add a weak-ptr liveness check around RequestStateFromServer(), mirroring
the existing pattern used elsewhere in this file and in
WaylandToplevelWindow::HandleToplevelConfigure().

Fixed: 518006275
Change-Id: I8812d780c4e46b42bc1a8302c69e4f2e8256b660
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7981871
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1651724}