Ah, I've found what is causing that: https://bazaar.launchpad.net/~webapps/unity-chromium-extension/trunk/view/head:/chromium-patches/stable-23.0.1271.64/4-chromeless-window-launch-option.patch#L392
But I'm not sure if that was really intended to affect non-webapps windows…
Ah, I've found what is causing that: https:/ /bazaar. launchpad. net/~webapps/ unity-chromium- extension/ trunk/view/ head:/chromium- patches/ stable- 23.0.1271. 64/4-chromeless -window- launch- option. patch#L392
But I'm not sure if that was really intended to affect non-webapps windows…