Add more missing closing namespace comments.

third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp

 /*
  * Copyright (C) 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 913 matching lines @@
     // enclosingFragmentationContext() right away. This test may give some false positives (hence
     // the "mayBe"), if we're in an out-of-flow subtree and have an outer multicol container that
     // doesn't affect us, but that's okay. We'll discover that further down the road when trying to
     // locate our enclosing flow thread for real.
     bool mayBeNested = multiColumnBlockFlow()->isInsideFlowThread() || view()->fragmentationContext();
     if (!mayBeNested)
         return;
     appendNewFragmentainerGroupIfNeeded(logicalBottomInFlowThreadAfterPagination);
 }
 
-}
+} // namespace blink