GitLab

Replace help center URLs with p-links. There is no change in the actual
destination pages.

Bug: 852139
Change-Id: I85176c6c2076d331ae58e10f7150ccf9c42da03e
Reviewed-on: https://chromium-review.googlesource.com/1147216Reviewed-by: Derek Cheng <imcheng@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577363}