Navi: Add check for Local NTP flag before testing experiment variations

Bug: 938093
Change-Id: Ib09b75a213d46536caf180bacb6eaf480372af2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529386
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642230}
4 files changed