Cleanup namespace usage in platform/graphics/[G-S]*

Source/platform/graphics/PathTraversalState.cpp

 /*
  * Copyright (C) 2006, 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 212 matching lines @@
             float offset = m_desiredLength - m_totalLength;
             m_current.move(offset * cosf(slope), offset * sinf(slope));
         } else {
             m_normalAngle = rad2deg(slope);
         }
         m_success = true;
     }
     m_previous = m_current;
 }
 
-}
+} // namespace blink