[js] createGeckoDriverService is obsolete. (#2719)

javascript/node/selenium-webdriver/firefox/index.js

@@ -305,30 +305,6 @@ function findGeckoDriver() {
 }
 
 
-/**
- * @param {(string|!Binary)} binary .
- * @return {!remote.DriverService} .
- */
-function createGeckoDriverService(binary) {
-  let exe = typeof binary === 'string' ?
-    Promise.resolve(binary) : binary.locate();
-
-  let geckoDriver = findGeckoDriver();
-  let port =  portprober.findFreePort();
-  let marionettePort = portprober.findFreePort();
-  return new remote.DriverService(geckoDriver, {
-    loopback: true,
-    port: port,
-    args: Promise.all([exe, port, marionettePort]).then(args => {
-      return ['-b', args[0],
-              '--port', args[1],
-              '--marionette-port', args[2]];
-    })
-    // ,stdio: 'inherit'
-  });
-}
-
-
 /**
  * @param {(Profile|string)} profile The profile to prepare.
  * @param {number} port The port the FirefoxDriver should listen on.