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Running |done_callback_| may delete |this|; it's not safe to continue
execution after that point.

Bug: 1064898
Change-Id: Iffcb4ac54d928c90c207f3455521dac08de0a469
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2122865
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Gabriel Marin <gmx@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Gabriel Marin <gmx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753790}