DevTools: bring hosted mode up-to-date with the new --custom-devtools-frontend

third_party/WebKit/Source/devtools/scripts/chrome_debug_launcher/launch_chrome.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var childProcess = require("child_process");
 var fs = require("fs");
 var path = require("path");
 var shell = childProcess.execSync;
 
 var remoteDebuggingPort = parseInt(process.env.REMOTE_DEBUGGING_PORT, 10) || 9222;
 var serverPort = parseInt(process.env.PORT, 10) || 8090;
 
 var chromeArgs = [
     `--remote-debugging-port=${remoteDebuggingPort}`,
+    `--custom-devtools-frontend=http://localhost:${serverPort}/front_end/`,
     `--no-first-run`,
-    `http://localhost:${remoteDebuggingPort}#http://localhost:${serverPort}/front_end/inspector.html?experiments=true`,
+    `http://localhost:${remoteDebuggingPort}#custom=true&experiments=true`,
     `https://devtools.chrome.com`
 ].concat(process.argv.slice(2));
 
 if (process.platform === "win32") {
     launchChromeWindows();
     return;
 }
 if (process.platform === "darwin") {
     launchChromeMac();
     return;
@@ skipping 78 matching lines @@
 {
     var string = buffer.toString();
     console.log(string);
     return string;
 }
 
 function shellOutput(command)
 {
     return shell(command).toString().trim();
 }