Make scoped_nsprotocol::release() private. (#21467)
Make scoped_nsprotocol::release() private. (#21467)

This is not used anywhere in the engine. However, this API is easy to misuse as
one might incorrectly assume that it releases the reference on the underlying
object. Callers must use `reset` for this purpose.
chinmaygarde/flutter_engine,chinmaygarde/sky_engine,aam/engine,flutter/engine,rmacnak-google/engine,jamesr/flutter_engine,devoncarew/sky_engine,rmacnak-google/engine,jason-simmons/sky_engine,jason-simmons/sky_engine,flutter/engine,devoncarew/sky_engine,jamesr/sky_engine,rmacnak-google/engine,flutter/engine,flutter/engine,devoncarew/engine,jamesr/sky_engine,jason-simmons/flutter_engine,jason-simmons/flutter_engine,Hixie/sky_engine,Hixie/sky_engine,jamesr/flutter_engine,chinmaygarde/sky_engine,Hixie/sky_engine,chinmaygarde/sky_engine,devoncarew/engine,flutter/engine,jason-simmons/sky_engine,Hixie/sky_engine,jason-simmons/flutter_engine,jamesr/flutter_engine,aam/engine,devoncarew/engine,chinmaygarde/flutter_engine,rmacnak-google/engine,chinmaygarde/flutter_engine,Hixie/sky_engine,jamesr/flutter_engine,Hixie/sky_engine,aam/engine,devoncarew/engine,rmacnak-google/engine,jason-simmons/flutter_engine,jamesr/flutter_engine,jason-simmons/flutter_engine,chinmaygarde/sky_engine,jason-simmons/flutter_engine,flutter/engine,Hixie/sky_engine,chinmaygarde/flutter_engine,jason-simmons/sky_engine,devoncarew/sky_engine,devoncarew/engine,jamesr/flutter_engine,chinmaygarde/flutter_engine,rmacnak-google/engine,rmacnak-google/engine,jamesr/sky_engine,jamesr/flutter_engine,jason-simmons/flutter_engine,aam/engine,devoncarew/engine,jamesr/flutter_engine,devoncarew/sky_engine,devoncarew/sky_engine,aam/engine,aam/engine,jason-simmons/flutter_engine,aam/engine,chinmaygarde/flutter_engine,jason-simmons/sky_engine,devoncarew/engine,flutter/engine,jamesr/sky_engine,chinmaygarde/flutter_engine,jason-simmons/sky_engine,jamesr/sky_engine,jason-simmons/sky_engine,jamesr/flutter_engine,aam/engine,chinmaygarde/sky_engine,chinmaygarde/sky_engine,jamesr/sky_engine,chinmaygarde/sky_engine,devoncarew/sky_engine,flutter/engine,jamesr/sky_engine,Hixie/sky_engine,devoncarew/sky_engine