Add more missing closing namespace comments.

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

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  *
  * 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 20 matching lines @@
 float ColorDistance::distance(const Color& fromColor, const Color& toColor)
 {
     int redDiff = toColor.red() - fromColor.red();
     int greenDiff = toColor.green() - fromColor.green();
     int blueDiff = toColor.blue() - fromColor.blue();
 
     // This is just a simple distance calculation, not respecting color spaces
     return sqrtf(redDiff * redDiff + blueDiff * blueDiff + greenDiff * greenDiff);
 }
 
-}
+} // namespace blink