Add more missing closing namespace comments.

third_party/WebKit/Source/core/svg/SVGAnimatedNumberOptionalNumber.cpp

 /*
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 42 matching lines @@
     m_firstNumber->animationEnded();
     m_secondNumber->animationEnded();
 }
 
 bool SVGAnimatedNumberOptionalNumber::needsSynchronizeAttribute()
 {
     return m_firstNumber->needsSynchronizeAttribute()
         || m_secondNumber->needsSynchronizeAttribute();
 }
 
-}
+} // namespace blink