Remove Robolectric workaround for nGetRunCharacterAdvance change

A fix for Robolectric has been made at the same time and this
workaround can be removed.

Bug: 319192202
Test: SystemUIGoogleRobo2RNGTests
Change-Id: I57d0689d6bdc8af12d671fbb6f9cbe8ea90da085
2 files changed