Uses the apex relative path to the file as the identifier that is used
to obtain the path to the corresponding file extracted from the apex.
That is instead of a special constructed string id.
Bug: 177892522
Test: m nothing
Merged-In: I5dc77c8fb272bac289b8891d1eac801e541af1f5
Change-Id: I5dc77c8fb272bac289b8891d1eac801e541af1f5
(cherry picked from commit b4bbf2ca10)