removed dead code behind legacy fontmgr api flag

Bug: skia:
Change-Id: I7766b10947df384b0e94a32642d5b4321f2e53bd
Reviewed-on: https://skia-review.googlesource.com/58241
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2 files changed