Trim away some dead code

The time zone listening is currently unused so can
be removed. Also removed an unused constant and made a
constant final.

Bug: 63743683
Test: Build
Merged-In: I15870a025e9acac597edd914c9e59df415108586
Change-Id: I15870a025e9acac597edd914c9e59df415108586
1 file changed