Revert "Merge pull request #10 from mozilla-b2g/empty-propstat"

This reverts commit ee5ae7a9c6ca0ce6136e9b97d4388a1434467b8b, reversing
changes made to 75c6e99f3d3ff16cc6f5dc26b7bf1dbbb4b3f648.

That was a bad idea on my part... its a lot easier/safer to fix this in gaia for now.