[java] Add deprecation annotation to Chromium headless metho

Related to #11467.

Author: pujagani

java/src/org/openqa/selenium/chromium/ChromiumOptions.java

@@ -186,6 +186,12 @@ public T setExperimentalOption(String name, Object value) {
     return (T) this;
   }
 
+  /**
+   * @deprecated Use {@link #addArguments(String...)}.
+   * Pass '--headless=chrome' as argument.
+   * Example: `addArguments("--headless=chrome")`.
+   */
+  @Deprecated
   public T setHeadless(boolean headless) {
     args.remove("--headless");
     if (headless) {