Add more missing closing namespace comments.

third_party/WebKit/Source/platform/weborigin/SecurityOriginCache.h

 /*
 * Copyright (C) 2013 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 
 class SecurityOriginCache {
     USING_FAST_MALLOC(SecurityOriginCache);
     WTF_MAKE_NONCOPYABLE(SecurityOriginCache);
 public:
     SecurityOriginCache() { }
     virtual ~SecurityOriginCache() { }
     virtual SecurityOrigin* cachedOrigin(const KURL&) = 0;
 };
 
-}
+} // namespace blink
 
 #endif // SecurityOriginCache_h