GitLab

Lookalike interstitials require committed interstitials to be
enabled, so add a check in tab_helper_util.

Change-Id: Ia991dcb4630b576cc7d59fd0ec2ce5a78c3d4de2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341040Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795647}