Working on this

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6c224c93f54e09a7f409de3ac96229b65ecc6705

commit 6c224c93f54e09a7f409de3ac96229b65ecc6705
Author: Sergio Villar Senin <svillar@igalia.com>
Date: Thu Dec 20 16:33:16 2018

Eliminate WebViewProfileSyncServiceFactory's dependence on PO2TS

The dependency is now stale as ProfileOAuth2TokenService is no longer
passed to ProfileSyncService.

Bug:  913928 
Change-Id: Ic2f3ccab8f9529638e18ae3e1d007f7ef1dc4284
Reviewed-on: https://chromium-review.googlesource.com/c/1386828
Reviewed-by: John Wu <jzw@chromium.org>
Commit-Queue: Sergio Villar <svillar@igalia.com>
Cr-Commit-Position: refs/heads/master@{#618239}
[modify] https://crrev.com/6c224c93f54e09a7f409de3ac96229b65ecc6705/ios/web_view/internal/sync/web_view_profile_sync_service_factory.mm