GitLab

Update the New Tab Bubble Promo String to "Add tabs and switch between
pages".

Bug: 779656
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ia42386ecc45e45ccf93105d48ff5bdd898cf4058
Reviewed-on: https://chromium-review.googlesource.com/809844Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: Gregory Chatzinoff <gchatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521860}