GitLab

Rename cache expiry field to be the last fetch
time that we did not hit the cache.

BUG=1053599

Change-Id: I4568e2494b84369430eef436d77bce8a43b260d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2137507Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757219}