Replace an OWNER of chrome/browser/ui/login

This CL removes meacer@ and adds carlosil@ as an owner.

Change-Id: Ic4ebf7b9b639ba7e23512cc80a73f29fd5f23b00
Reviewed-on: https://chromium-review.googlesource.com/c/1281241Reviewed-by: Carlos IL <carlosil@chromium.org>
Reviewed-by: Vaclav Brozek <vabr@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600135}

chrome/browser/ui/login/OWNERS

+carlosil@chromium.org
 davidben@chromium.org
-meacer@chromium.org
 vabr@chromium.org
 
 # COMPONENT: Internals>Network>Auth