Stop requiring top level OWNER for string changes

Bug: None
Test: None
Change-Id: Ibcd365ff49083f783e53ca6c3f85dd55991db83b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511849
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Auto-Submit: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822871}

chromeos/OWNERS

@@ -6,6 +6,8 @@
 per-file BUILD.gn=*
 # Translation artifacts:
 per-file *.xtb=file://tools/translation/TRANSLATION_OWNERS
+# Strings
+per-file chromeos_strings.grd=*
 
 # PST
 achuith@chromium.org

chromeos/chromeos_strings_grd/OWNERS

+# Any Chromium committer can approve changes to strings *.grd files, so they are
+# also allowed to approve the corresponding sha1 hashes for string translation.
+per-file *.png.sha1=*
+
 # COMPONENT: UI>Shell