WebUI: Migrate 'Manage search engines' button to cr-link-row

Bug: 908325
Change-Id: Ifd84b8fcef8ed1ad074909cfecce6a7cfef31d52
Reviewed-on: https://chromium-review.googlesource.com/c/1376666
Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616929}
2 files changed