message: Delete deprecated dummy method GetNetworks(NetworkList* networks).
  Followup to
  Cr-Commit-Position: refs/heads/main@{#36497}
diff: @@ -148,11 +148,6 @@ class RTC_EXPORT NetworkManager : public DefaultLocalAddressProvider,
  virtual void StartUpdating() = 0;
  virtual void StopUpdating() = 0;
  - // TODO(bugs.webrtc.org/13869): Delete after override in downstream subclasses
  - // is deleted.
  - ABSL_DEPRECATED("bugs.webrtc.org/13869")
  - virtual void GetNetworks(NetworkList* networks) const {}
  -
  // Returns the current list of networks available on this machine.
  // StartUpdating() must be called before this method is called.
  // It makes sure that repeated calls return the same object for a
  