Extend expiration for Sync.E2ELatency

Latency is a priority for our team in the next year so we're extending
the expiration for the relevant metrics.

Bug: 988629
Change-Id: I2b26a29d3722d6dfa0907eb626eddf07c8d1ead8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731830
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Christopher Thompson <cthomp@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683516}
1 file changed