Add pref dom.image.picture.enabled from https://hg.mozilla.org/mozilla-central/rev/500bca3a7429
Add pref dom.image.picture.enabled from https://hg.mozilla.org/mozilla-central/rev/500bca3a7429

MozillaSecurity/funfuzz,nth10sd/funfuzz,MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz