message: [DVQA] Remove old constructor from StatsKey
  Cr-Commit-Position: refs/heads/main@{#35405}
diff: @@ -157,12 +157,6 @@ struct AnalyzerStats {
  };
  struct StatsKey {
  - // Keep this constructor for temporary backward compatibility.
  - StatsKey(std::string stream_label,
  - std::string /*sender*/,
  - std::string receiver)
  - : stream_label(std::move(stream_label)), receiver(std::move(receiver)) {}
  -
  StatsKey(std::string stream_label, std::string receiver)
  : stream_label(std::move(stream_label)), receiver(std::move(receiver)) {}
  