fix(tooling): migrate kythefs from deprecated FileTree API (#3564)
fix(tooling): migrate kythefs from deprecated FileTree API (#3564)


kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe