Add myself as an OWNER for printing_page.

Also add ownership to some Chrome OS settings tests.

Change-Id: Ib3b37c099bb21b0fa830765c9bc92aa6e896b744
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764763
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689528}

chrome/browser/resources/settings/printing_page/OWNERS

+khorimoto@chromium.org
+stevenjb@chromium.org

chrome/test/data/webui/settings/chromeos/OWNERS

 file://chrome/browser/resources/settings/chromeos/OWNERS
 
+per-file *printer*=khorimoto@chromium.org
+per-file *multidevice*=khorimoto@chromium.org
+per-file *internet*=khorimoto@chromium.org
+
 # COMPONENT: OS>Systems>Settings