Add more missing closing namespace comments.

third_party/WebKit/Source/platform/text/QuotedPrintable.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:
  *
  *     * 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 133 matching lines @@
             // Invalid sequence, = followed by non hex digits, just insert the characters as is.
             out.append('=');
             out.append(upperCharacter);
             out.append(lowerCharacter);
             continue;
         }
         out.append(static_cast<char>(toASCIIHexValue(upperCharacter, lowerCharacter)));
     }
 }
 
-}
+} // namespace blink