Add more missing closing namespace comments.

third_party/WebKit/Source/core/dom/RangeBoundaryPoint.h

 /*
  * Copyright (C) 2008 Apple Inc. 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 188 matching lines @@
     if (a.childBefore() || b.childBefore()) {
         if (a.childBefore() != b.childBefore())
             return false;
     } else {
         if (a.offset() != b.offset())
             return false;
     }
     return true;
 }
 
-}
+} // namespace blink
 
 #endif