Add more missing closing namespace comments.

third_party/WebKit/Source/platform/geometry/FloatRect.cpp

 /*
  * Copyright (C) 2003, 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2005 Nokia.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 214 matching lines @@
     if (!srcRect.width() || !srcRect.height())
         return FloatRect();
 
     float widthScale = destRect.width() / srcRect.width();
     float heightScale = destRect.height() / srcRect.height();
     return FloatRect(destRect.x() + (r.x() - srcRect.x()) * widthScale,
         destRect.y() + (r.y() - srcRect.y()) * heightScale,
         r.width() * widthScale, r.height() * heightScale);
 }
 
-}
+} // namespace blink