Remove lpromero@ from OWNERS files

As lpromero@ stopped working on Chromium, remove them from the
OWNERS files (thus people will stop sending them CLs they won't
review).

Bug: none
Change-Id: I0fb6aa9bf7774ff6dda6111c5238dae4ce1191db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2023651
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Eric Noyau <noyau@chromium.org>
Reviewed-by: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735837}

ios/chrome/browser/ui/payments/OWNERS

-lpromero@chromium.org
 mahmadi@chromium.org
 
 # TEAM: ios-directory-owners@chromium.org

third_party/material_design_icons/OWNERS

-lpromero@chromium.org
 sdefresne@chromium.org
 # COMPONENT: Internals