Add more missing closing namespace comments.

third_party/WebKit/Source/core/svg/SVGDocumentExtensions.h

 /*
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  * Copyright (C) 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * 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,
@@ skipping 100 matching lines @@
     void serviceAnimations(double monotonicAnimationStartTime);
 
     // The following two functions are used for scheduling a pending resource to be removed.
     void markPendingResourcesForRemoval(const AtomicString&);
     Element* removeElementFromPendingResourcesForRemoval(const AtomicString&);
 
 private:
     PassOwnPtrWillBeRawPtr<SVGPendingElements> removePendingResourceForRemoval(const AtomicString&);
 };
 
-}
+} // namespace blink
 
 #endif