Add more missing closing namespace comments.

third_party/WebKit/Source/core/layout/svg/LayoutSVGBlock.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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.
  *
@@ skipping 103 matching lines @@
 
 void LayoutSVGBlock::invalidateTreeIfNeeded(PaintInvalidationState& paintInvalidationState)
 {
     if (!shouldCheckForPaintInvalidation(paintInvalidationState))
         return;
 
     ForceHorriblySlowRectMapping slowRectMapping(&paintInvalidationState);
     LayoutBlockFlow::invalidateTreeIfNeeded(paintInvalidationState);
 }
 
-}
+} // namespace blink