build: remove chrome sandbox workaround (#9498)

In order to align with the `angular/angular` setup, we also remove the temporary Chrome Headless Sandbox workaround in favor of faster Travis CI containers. To be able to still use headless chrome, we specify the `no-sandbox` flag.

Reference https://github.com/angular/angular/pull/21641

test/protractor.conf.js

@@ -37,6 +37,7 @@ const config = {
 
 if (process.env['TRAVIS']) {
   const key = require('../scripts/saucelabs/sauce_config');
+
   config.sauceUser = process.env['SAUCE_USERNAME'];
   config.sauceKey = key;
   config.capabilities = {

test/remote_browsers.json

@@ -5,15 +5,19 @@
       "--window-size=1024,768"
     ]
   },
+  "ChromeHeadlessCI": {
+    "base": "ChromeHeadless",
+    "flags": [
+      "--window-size=1024,768",
+      "--no-sandbox"
+    ]
+  },
   "FirefoxHeadless": {
     "base": "Firefox",
     "flags": [
       "-headless"
     ]
   },
-  "ChromeHeadlessCI": {
-    "base": "ChromeHeadlessLocal"
-  },
   "SL_CHROME": {
     "base": "SauceLabs",
     "browserName": "chrome",