Ok, so, on Intel's page there is an announcement about Crosswalk 7 OpenSSL update.
(software.intel.com, search for 'crosswalk-7 open ssl update'. Sorry - I don't have enough rep for posting urls)
As imaffett promised, there's also a sample petition text that we can use to explain Google that the openssl issue flag is false positive.
Did anyone compile anything in Crosswalk 7 and wrote to Google with that petition? On which address do you send it, and do you send it immediately after you published the app, or after the Google warning appears?