operasoftware/operadriver — pull request #89 by alex-savchuk (2013-04-15 20:04:01+00:00)
Title: Deleting "invisible" cookie should be no-op action

Deleting "invisible" cookie should do nothing (be no-op action) according to
https://code.google.com/p/selenium/wiki/JsonWireProtocol#/session/:sessionId/cookie/:name

It fixes https://code.google.com/p/selenium/issues/detail?id=5187