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XWindow can be destroyed in the middle of a delayed resize closure
execution. It may happen when that window is snapped into a tab bar.
More specifically when a nested move loop, used to intercept and forward
the mouse events during a tab dragging session, is triggered by a bounds
change event notified from a delayed resize task.

To fix it, this uses a weak pointer to verify whether the window
instance is still alive after notifying the bounds change in the delayed
resize function implementation.

Bug: 1068755, 1021490
Change-Id: I08eff38d5f5f28ec54e489dc183f3f0cfdde2480
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144996Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#758552}