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ClosedTabCache aims to make the "Reopen closed tab" button instant
for recently closed tabs.

Design doc:
https://docs.google.com/document/d/1SF230MYWgroe4WikDMn82ETd3-HFRzylKtIk0HZRaOU

BUG=1100946

Change-Id: I43934b0fe8b60ca9bbc09f27bbb62b38e33891d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274509Reviewed-by: Carlos Caballero <carlscab@google.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Sreeja Kamishetty <sreejakshetty@chromium.org>
Commit-Queue: Andreea Bacanu <aebacanu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784455}