Add more missing closing namespace comments.

third_party/WebKit/Source/core/html/HTMLLabelElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 266 matching lines @@
     } else {
         if (attributeName == forAttr) {
             TreeScope& scope = treeScope();
             if (scope.shouldCacheLabelsByForAttribute())
                 updateLabel(scope, oldValue, attributeValue);
         }
         HTMLElement::parseAttribute(attributeName, oldValue, attributeValue);
     }
 }
 
-} // namespace
+} // namespace blink