Revert "Revert "Remove unused String8::setPathName.""

This reverts commit 70d9fb63e60392d1e3f59cc2967f3247a0645e6c.

Reason for revert: Outstanding usage of this method removed internally

Change-Id: Idcc00ec261aa1d97f11e47abdb08b10a37b5d20f
Test: Local build; treehugger (which I'll manually confirm runs on the appropriate targets)
3 files changed