Add more missing closing namespace comments.

third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 56 matching lines @@
 LayoutObject* nextSiblingLayoutObject(const Node&);
 LayoutObject* previousSiblingLayoutObject(const Node&);
 LayoutObject* nextInTopLayer(const Element&);
 
 inline Element* parentElement(const Node& node)
 {
     ContainerNode* found = parent(node);
     return found && found->isElementNode() ? toElement(found) : 0;
 }
 
-}
+} // namespace LayoutTreeBuilderTraversal
 
 } // namespace blink
 
 #endif