Add more missing closing namespace comments.

third_party/WebKit/Source/core/dom/SecurityContext.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 64 matching lines @@
 void SecurityContext::enforceSandboxFlags(SandboxFlags mask)
 {
     m_sandboxFlags |= mask;
 
     if (isSandboxed(SandboxOrigin) && securityOrigin() && !securityOrigin()->isUnique()) {
         setSecurityOrigin(SecurityOrigin::createUnique());
         didUpdateSecurityOrigin();
     }
 }
 
-}
+} // namespace blink