code style

Author: rbri

src/main/java/org/htmlunit/css/BrowserConfiguration.java

@@ -121,7 +121,7 @@ static BrowserConfiguration ffEsr(final String defaultValue) {
         return new FFESR(defaultValue);
     }
 
-    static class ChromeAndEdgeNotIterable extends BrowserConfiguration {
+    private static class ChromeAndEdgeNotIterable extends BrowserConfiguration {
         ChromeAndEdgeNotIterable(final String defaultValue) {
             super(defaultValue);
         }