{"type":"change-abandoned",
 "change":{"project":"project-name",
           "branch":"branch-name",
           "topic":"topic-name",
           "id":"Ideadbeefdeadbeefdeadbeefdeadbeefdeadbeef",
           "number":"123456",
           "subject":"Commit message subject",
           "owner":{"name":"Owner Name",
                    "email":"owner@example.com"},
           "url":"http://review.example.com/123456"},
 "abandoner":{"name":"Abandoner Name",
              "email":"abandoner@example.com"},
 "reason":"Abandon reason"}