GitLab

This ensures that an old previews_freshness_ won't be shown on the
wrong page.

Bug: 898570
Change-Id: I19cb1ab9916eae9b80fb4ca8d260cd18ebd66a97
Reviewed-on: https://chromium-review.googlesource.com/c/1298245Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602528}