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Crash stack traces are pointing to very occasional errors with AXPosition.
They all seem to be cases where a DCHECK would have failed. I think the
best approach is to not only DCHECK but also gracefully handle the failure
case if it does occur. Not setting the selection doesn't have to be a
fatal error.

Bug: 1116340
Change-Id: I038dc793118214905aa46daf587b9c7a2f9018e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404386
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806687}