Revert "bug 1026543 - expose tab.readyState property"

This reverts commit b1f99ec70b64fd0e2e77dbed77504f2dc0a1cd82.
Revert "bug 1026543 - oops, fennec"

This reverts commit 424d24e43b292101bf7ce7da4a5dfcfc56ed7b7a.