Add more missing closing namespace comments.

third_party/WebKit/Source/platform/UUID.h

 /*
 * Copyright (C) 2010 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 32 matching lines @@
 // Note: for security reason, we should always generate version 4 UUID that use a scheme relying only on random numbers.
 // This algorithm sets the version number as well as two reserved bits. All other bits are set using a random or pseudorandom
 // data source. Version 4 UUIDs have the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx with hexadecimal digits for x and one of 8,
 // 9, A, or B for y.
 PLATFORM_EXPORT String createCanonicalUUIDString();
 
 // Check that the UUID is a valid UUID. A valid UUID is a string made out of 5 groups
 // of lower case hexadecimal characters separated by hyphens, in the form 8-4-4-4-12.
 PLATFORM_EXPORT bool isValidUUID(const String& uuid);
 
-}
+} // namespace blink
 
 #endif