Add nancylingwang to app_service OWNERs.

Bug: None
Change-Id: I4d797045609142e466d030b6bb7911ca57cdcc86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900788
Auto-Submit: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713379}

chrome/browser/apps/app_service/OWNERS

-file://chrome/services/app_service/OWNERS
+file://components/services/app_service/OWNERS

chrome/services/app_service/OWNERS

-benwells@chromium.org
-dominickn@chromium.org
-nigeltao@chromium.org
-
-# COMPONENT: Platform>Apps>Foundation
+file://components/services/app_service/OWNERS

components/services/app_service/OWNERS

 dominickn@chromium.org
+nancylingwang@chromium.org
 nigeltao@chromium.org
+
+# COMPONENT: Platform>Apps>Foundation