custom-tabs-client: Remove pasko from OWNERS

Justification: as in http://crrev.com/c/1529410/
Change-Id: I00ce8b2e800484f05945cb483b90decc198fedbd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529054
Commit-Queue: Peter Conn <peconn@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641836}

third_party/custom_tabs_client/OWNERS

 lizeb@chromium.org
-pasko@chromium.org
 peconn@chromium.org
 yusufo@chromium.org
 

third_party/custom_tabs_client/README.chromium

@@ -16,4 +16,4 @@ custom tabs in different modes.
 The example applicaton also presents how to use Browser Actions, including
 creating request intent and adding custom items.
 
-Local Modifications: none
+Local Modifications: None