Revert^2 "Rename DexJar interface method to DexJarBuildPath."

This reverts commit b0dc851f.

Reason for revert: relanding original change. Build failures were
  caused by a race with another CL: https://r.android.com/1320920

Test: lunch aosp_cf_x86_phone-userdebug && m
Change-Id: Ic9016582dae7773b4d4f84a63425f1ef7a5d061f