Add missing closing namespace comments to wtf.

third_party/WebKit/Source/wtf/ConditionalDestructor.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ConditionalDestructor_h
 #define ConditionalDestructor_h
 
 namespace WTF {
 
 // ConditionalDestructor defines the destructor of the derived object.
 // This base is used in order to completely avoid creating a destructor
 // for an object that does not need to be destructed. By doing so,
 // the clang compiler will have correct information about whether or not
 // the object has a trivial destructor.
 // Note: the derived object MUST release all its recources at the finalize()
 // method.
 template<typename Derived, bool noDestructor>
 class ConditionalDestructor {
 public:
     ~ConditionalDestructor() { static_cast<Derived*>(this)->finalize(); }
 };
 
 template<typename Derived>
 class ConditionalDestructor<Derived, true> { };
 
-}
+} // namespace WTF
 
 #endif // ConditionalDestructor_h