Add more missing closing namespace comments.

third_party/WebKit/Source/platform/text/SegmentedString.cpp

 /*
     Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 275 matching lines @@
     int zeroBasedColumn = numberOfCharactersConsumed() - m_numberOfCharactersConsumedPriorToCurrentLine;
     return OrdinalNumber::fromZeroBasedInt(zeroBasedColumn);
 }
 
 void SegmentedString::setCurrentPosition(OrdinalNumber line, OrdinalNumber columnAftreProlog, int prologLength)
 {
     m_currentLine = line.zeroBasedInt();
     m_numberOfCharactersConsumedPriorToCurrentLine = numberOfCharactersConsumed() + prologLength - columnAftreProlog.zeroBasedInt();
 }
 
-}
+} // namespace blink