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When under memory pressure, we need to make sure all objects exist and
that the callback is the last thing resolved. Otherwise `this` might be
gone.

Bug: 1148268
Change-Id: I0bc7c5ec29b4189f19b7936b20fc7cd6b8489d5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533900
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Auto-Submit: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826883}