Remove unused native methods.

Relates to libcore change:
https://googleplex-android-review.git.corp.google.com/355739

(cherry picked from commit 0daaa9d65217e43f24d009726130d0e0ca6c9fd1)

Change-Id: I72fe92c4c0051fcd4474d167c7760cf9f666afd6
1 file changed