Bug 1578361 - removed unused localTransport getter on debugger-client r=ladybenko

This was initially added in Bug 907755 for old telemetry probes.

Differential Revision: https://phabricator.services.mozilla.com/D44444

--HG--
extra : moz-landing-system : lando

devtools/shared/client/debugger-client.js

@@ -58,7 +58,6 @@ function DebuggerClient(transport) {
   this.traits = {};
 
   this.request = this.request.bind(this);
-  this.localTransport = this._transport.onOutputStreamReady === undefined;
 
   /*
    * As the first thing on the connection, expect a greeting packet from