message: remove unused variable kRoot
diff: @@ -32,7 +32,6 @@ namespace verilog {
  namespace kythe {
  namespace {
  -constexpr absl::string_view kRoot = "root/";
  constexpr absl::string_view kProtoUnitRoot = "root/pbunits/";
  constexpr absl::string_view kFileRoot = "root/files/";
  