This was dead code. PreParseCommandLine was called only when tracing was
enabled, which meant that the tracing itself was useless, as it was not
tracing what the actual code was doing.
I believe the intention of this tracing was to "guess" how the native
commands on Windows *might* parse their command-line arguments, but the
traced result was not guaranteed to be accurate. Since we cannot provide
accurate tracing, the tracer was removed in its entirety.
The PreParseCommandLine function was the only place where
CommandLineToArgv was called, so with it removed, the entire native
methods class here can be removed.