base: Add/Fix namespace closing comments.

base/auto_reset.h

 // Copyright (c) 2011 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 BASE_AUTO_RESET_H_
 #define BASE_AUTO_RESET_H_
 
 #include "base/basictypes.h"
 
 // base::AutoReset<> is useful for setting a variable to a new value only within
@@ skipping 18 matching lines @@
 
   ~AutoReset() { *scoped_variable_ = original_value_; }
 
  private:
   T* scoped_variable_;
   T original_value_;
 
   DISALLOW_COPY_AND_ASSIGN(AutoReset);
 };
 
-}
+}  // namespace base
 
 #endif  // BASE_AUTO_RESET_H_