Change flag for Chrome/Edge headless mode in tests (#15831)

* Change Chrome/Edge startup flag from `--headless=new` to `--headless`

Author: cgoldberg

java/test/org/openqa/selenium/edge/EdgeDriverFunctionalTest.java

@@ -116,7 +116,7 @@ void canSetPermission() {
   @NoDriverBeforeTest
   public void canSetPermissionHeadless() {
     EdgeOptions options = new EdgeOptions();
-    options.addArguments("--headless=new");
+    options.addArguments("--headless");
 
     localDriver = new WebDriverBuilder().get(options);
     HasPermissions permissions = (HasPermissions) localDriver;

java/test/org/openqa/selenium/testing/drivers/Browser.java

@@ -50,7 +50,7 @@ public Capabilities getCapabilities() {
       }
 
       if (Boolean.getBoolean("webdriver.headless")) {
-        options.addArguments("--headless=new");
+        options.addArguments("--headless");
       }
 
       options.addArguments(
@@ -84,7 +84,7 @@ public Capabilities getCapabilities() {
       }
 
       if (Boolean.getBoolean("webdriver.headless")) {
-        options.addArguments("--headless=new");
+        options.addArguments("--headless");
       }
 
       options.addArguments(

py/conftest.py

@@ -229,7 +229,7 @@ def get_options(driver_class, config):
 
     if headless:
         if driver_class == "Chrome" or driver_class == "Edge":
-            options.add_argument("--headless=new")
+            options.add_argument("--headless")
         if driver_class == "Firefox":
             options.add_argument("-headless")
 
@@ -393,6 +393,6 @@ def chromium_options(request):
         options = webdriver.EdgeOptions()
 
     if request.config.option.headless:
-        options.add_argument("--headless=new")
+        options.add_argument("--headless")
 
     return options