fix missing final

Author: rbri

src/main/java/org/htmlunit/html/DomElement.java

@@ -814,7 +814,7 @@ public DomElement getLastElementChild() {
     public int getChildElementCount() {
         int counter = 0;
 
-        for (DomElement domElement : getChildElements()) {
+        for (final DomElement domElement : getChildElements()) {
             counter++;
         }
         return counter;

src/main/java/org/htmlunit/html/DomNode.java

@@ -1461,7 +1461,7 @@ private DomNode getNextElementUpwards(final DomNode startingNode) {
 
             DomNode parent = startingNode.getParentNode();
             while (parent != null && parent != DomNode.this) {
-                DomNode next = parent.getNextSibling();
+                final DomNode next = parent.getNextSibling();
                 if (next != null) {
                     return next;
                 }

src/main/java/org/htmlunit/javascript/host/dom/Document.java

@@ -1261,7 +1261,7 @@ private static org.w3c.dom.traversal.NodeFilter createFilterWrapper(final Script
      */
     @JsxFunction
     public TreeWalker createTreeWalker(final Node root, final double whatToShow, final Scriptable filter,
-            boolean expandEntityReferences) throws DOMException {
+            final boolean expandEntityReferences) throws DOMException {
 
         // seems that Rhino doesn't like long as parameter type
         // this strange conversation preserves NodeFilter.SHOW_ALL