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Darren Shen authored
ScopedObservation is much safer and cleaner. Change-Id: I189991b7aafb2cda41fa77a468b1f9a8a213fa10 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522811 Commit-Queue: Darren Shen <shend@chromium.org> Reviewed-by:
Alexey Baskakov <loyso@chromium.org> Cr-Commit-Position: refs/heads/master@{#826210}
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