Move //{chromeos=>ash}/services/device_sync [1/3]

This CL moves proto/ to ash from chromeos.

This CL is part of the Chrome OS source code directory migration:
https://docs.google.com/document/d/1g-98HpzA8XcoGBWUv1gQNr4rbnD5yfvbtYZyPDDbkaE.

Bug: 1164001
Change-Id: Ibc27e9f6f3118435eb12cc4d1493867702e43886
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3490510
Reviewed-by: Hidehiko Abe <[email protected]>
Owners-Override: Hidehiko Abe <[email protected]>
Commit-Queue: Yeunjoo Choi <[email protected]>
Cr-Commit-Position: refs/heads/main@{#977451}
diff --git a/WATCHLISTS b/WATCHLISTS
index b87b2f3..41d3563 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -1362,6 +1362,7 @@
       'filepath': 'ash/components/proximity_auth/'\
                   '|ash/multi_device_setup/'\
                   '|ash/resources/multidevice_resources.grdp'\
+                  '|ash/services/device_sync/'\
                   '|ash/services/multidevice_setup/'\
                   '|ash/services/secure_channel/'\
                   '|chrome/browser/ash/cryptauth/'\