Add more missing closing namespace comments.

third_party/WebKit/Source/modules/filesystem/DirectoryReaderSync.cpp

 /*
  * 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 107 matching lines @@
     result.swap(m_entries);
     return result;
 }
 
 DEFINE_TRACE(DirectoryReaderSync)
 {
     visitor->trace(m_entries);
     DirectoryReaderBase::trace(visitor);
 }
 
-} // namespace
+} // namespace blink