Add missing closing namespace comments to wtf.

third_party/WebKit/Source/wtf/CheckedArithmetic.h

 /*
  * Copyright (C) 2011 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 687 matching lines @@
 template <typename U, typename V, typename OverflowHandler> static inline Checked<typename Result<U, V>::ResultType, OverflowHandler> operator-(U lhs, Checked<V, OverflowHandler> rhs)
 {
     return Checked<U, OverflowHandler>(lhs) - rhs;
 }
 
 template <typename U, typename V, typename OverflowHandler> static inline Checked<typename Result<U, V>::ResultType, OverflowHandler> operator*(U lhs, Checked<V, OverflowHandler> rhs)
 {
     return Checked<U, OverflowHandler>(lhs) * rhs;
 }
 
-}
+} // namespace WTF
 
 using WTF::Checked;
 using WTF::CheckedState;
 using WTF::RecordOverflow;
 
 #endif