Add more missing closing namespace comments.

third_party/WebKit/Source/core/layout/compositing/CompositingTriggers.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple, Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. 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.
  *
@@ skipping 15 matching lines @@
 
 enum CompositingTrigger {
     ScrollableInnerFrameTrigger = 1 << 1,
     OverflowScrollTrigger = 1 << 2,
     ViewportConstrainedPositionedTrigger = 1 << 3,
     AllCompositingTriggers = 0xFFFFFFFF,
 };
 
 typedef unsigned CompositingTriggerFlags;
 
-}
+} // namespace blink
 
 #endif