Add more missing closing namespace comments.

third_party/WebKit/Source/core/editing/commands/TextInsertionBaseCommand.h

 /*
  * 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 48 matching lines @@
     }
     if (!offset) {
         operation(0, string.length(), true);
     } else {
         unsigned length = string.length();
         if (length != offset)
             operation(offset, length - offset, true);
     }
 }
 
-}
+} // namespace blink
 
 #endif