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This behavior broke in a recent change, causing stale thumbnails and a
DCHECK in enabled builds.

Fixed: 1137330
Bug: 1136247
Change-Id: I70bee4d25e2c0693bcf55fe95dc2744dfb354456
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464785Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816305}