Add account_manager_* per-file OWNERS to settings/chromeos/OWNERS

Point account_manager_* per-file OWNERS to OWNERS of Chrome OS
Account Manager.

Change-Id: Ie7d1a218182eaafdd5df6f06e950f1b4707c093d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438249Reviewed-by: Kush Sinha <sinhak@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Anastasiia N <anastasiian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811715}

chrome/browser/ui/webui/settings/chromeos/OWNERS

@@ -2,5 +2,6 @@ file://chrome/browser/resources/settings/chromeos/OWNERS
 
 per-file languages_section*=myy@chromium.org
 per-file multidevice_handler*=file://chromeos/components/multidevice/OWNERS
+per-file account_manager_*=file://chromeos/components/account_manager/OWNERS
 
 # COMPONENT: OS>Systems>Settings