Remove invalid property.
Remove invalid property.

Since we're unsure of what this value should be and it has existed this long, simply removing and not making valid as to try and not break existing applications.
google/material-design-lite,i9-Technologies/material-design-lite,Kekanto/material-design-lite,tradeserve/material-design-lite,dgrubelic/material-design-lite,google/material-design-lite,Kekanto/material-design-lite,dgrubelic/material-design-lite,tradeserve/material-design-lite,i9-Technologies/material-design-lite