Revert "Bug 920839 - Added spinbutton ARIA markup to value picker."

This reverts commit 0d5fd65dc4f43102c38fafb756f0b9c1968d74c3.
Revert "Bug 920839 - ARIA fixes to value selector."

This reverts commit 2c585692098082a9bb38558c8739a8e91cda5591.