Add more missing closing namespace comments.

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

 /*
  * Copyright (C) Research In Motion Limited 2010-2012. 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 99 matching lines @@
     case FontOrientation::VerticalRotated:
         return width();
     case FontOrientation::VerticalUpright:
         return height();
     default:
         ASSERT_NOT_REACHED();
         return width();
     }
 }
 
-}
+} // namespace blink