Fix closing namespace comments in //net.

net/base/zap.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 NET_BASE_ZAP_H_
 #define NET_BASE_ZAP_H_
 
 #include <stddef.h>
 
 #include <string>
 
 #include "base/strings/string16.h"
 
 namespace net {
 
 // Zap functions are used to clear sensitive data in RAM to minimize the
 // time that people can access them once they are written to disk.
 
 // Overwrite a buffer  with 0's.
 void ZapBuf(void* buf, size_t buf_len);
 
 // Overwrite a string's internal buffer with 0's.
 void ZapString(std::string* s);
 
 // Overwrite a base::string16's internal buffer with 0's.
 void ZapString(base::string16* s);
 
-}  // net
+}  // namespace net
 
 #endif  // NET_BASE_ZAP_H_