Sync the BarProp interface with the spec
Sync the BarProp interface with the spec

https://html.spec.whatwg.org/#barprop

BUG=460722
NOTRY=true

Review URL: https://codereview.chromium.org/1157893002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@195871 bbb929c8-8fbe-4397-9dbb-9b2b20218538

Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk