Bug 1504807 - [marionette] Remove call to non-existent "Marionette:newSession" message listener. r=ato

Differential Revision: https://phabricator.services.mozilla.com/D10998

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

testing/marionette/driver.js

@@ -3411,10 +3411,6 @@ GeckoDriver.prototype.receiveMessage = function(message) {
 
     case "Marionette:ListenersAttached":
       if (message.json.outerWindowID === this.curBrowser.curFrameId) {
-        // If the frame script gets reloaded we need to call newSession.
-        // In the case of desktop this just sets up a small amount of state
-        // that doesn't change over the course of a session.
-        this.sendAsync("newSession");
         this.curBrowser.flushPendingCommands();
       }
       break;