Add rsorokin@ to OWNERS.

Change-Id: Id9cf817d2ed48f35cdf0fca65ff061ab004fe587
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1543260Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645359}

WATCHLISTS

@@ -2132,6 +2132,7 @@
     'chromeos_login': ['achuith+watch@chromium.org',
                        'alemate+watch@chromium.org',
                        'jdufault+watch@chromium.org',
+                       'rsorokin+watch@chromium.org',
                        'tbarzic+watch@chromium.org'],
     'chromeos_net': ['stevenjb+watch@chromium.org'],
     'chromeos_power': ['derat+watch@chromium.org'],

chrome/browser/chromeos/login/OWNERS

@@ -3,7 +3,7 @@ achuith@chromium.org
 alemate@chromium.org
 jdufault@chromium.org
 tbarzic@chromium.org
-  xiyuan@chromium.org
+xiyuan@chromium.org
 
 # (in CET)
 antrim@chromium.org

chrome/browser/chromeos/login/saml/OWNERS

+# (in PST)
+xiyuan@chromium.org
+
+# (in CET)
+rsorokin@chromium.org

chrome/browser/resources/gaia_auth_host/OWNERS

+# (in PST)
 achuith@chromium.org
 xiyuan@chromium.org
+
+# (in CET)
+rsorokin@chromium.org