Remove unused method in DEX-to-DEX.
Remove unused method in DEX-to-DEX.

Change-Id: Ice5f91b45a0ad85576475a613193f143fd76ad9f

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst