Add more missing closing namespace comments.

third_party/WebKit/Source/core/dom/shadow/SelectRuleFeatureSet.cpp

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 80 matching lines @@
         if (remainingClassBits.quickGet(i))
             continue;
 
         // Class was removed.
         if (hasSelectorForClass(oldClasses[i]))
             return true;
     }
     return false;
 }
 
-}
-
+} // namespace blink