GitLab

- Rename Persistence.js to PersistenceImpl to avoid a name clash with
the namespace

Bug: 1006759
Change-Id: I330bd680c8a92984c4a75a0614efa78b4f1e1ea2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845715
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Paul Lewis <aerotwist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704200}