base: Add/Fix namespace closing comments.

base/guid_win.cc

 // Copyright (c) 2012 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 "base/guid.h"
 
 #include <stdlib.h>
 
 #include <objbase.h>
 #include <windows.h>
@@ skipping 17 matching lines @@
   std::wstring guid_string;
   int result = StringFromGUID2(guid,
                                WriteInto(&guid_string, kGUIDSize), kGUIDSize);
   DCHECK(result == kGUIDSize);
   if (result != kGUIDSize)
     return std::string();
 
   return WideToUTF8(guid_string.substr(1, guid_string.length() - 2));
 }
 
-}  // namespace guid
+}  // namespace base