Fix closing namespace comments in //net.

net/base/zap.cc

 // 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.
 
 #include "net/base/zap.h"
 
 #include <string.h>
 
 namespace net {
 
 void ZapBuf(void* buf, size_t buf_len) {
   memset(buf, 0x0, buf_len);
 }
 
 void ZapString(std::string* s) {
   if (!s->empty())
     ZapBuf(&(*s)[0], s->length() * sizeof(char));
 }
 
 void ZapString(base::string16* s) {
   if (!s->empty())
     ZapBuf(&(*s)[0], s->length() * sizeof(base::char16));
 }
 
-}  // net
+}  // namespace net