Re-generating generated DOM files.

tools/html_json_doc/lib/json_to_html.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Library for taking a JSON file and putting the comments located within into
  * the HTML files the comments are associated with.
  *
  * The format of the JSON file is:
  *
@@ skipping 122 matching lines @@
       unusedComments.putIfAbsent(key, () => comments);
     }
   });
 
   unusedComments.forEach((String key, _) {
     print('WARNING: the following key was found in the JSON but not in '
         '${new Path(file.fullPathSync()).filename}:\n"$key"');
     _anyErrors = true;
   });
 
+  for (var i = 0; i < fileLines.length; ++i) {
+    fileLines[i] = fileLines[i].replaceAll(new RegExp(r'\s+$'), '');
+  }
+
   // TODO(amouravski): file.writeAsStringSync('${Strings.join(fileLines, '\n')}\n');
   var outputStream = file.openOutputStream();
   outputStream.writeString(Strings.join(fileLines, '\n'));
   outputStream.writeString('\n');
 
   outputStream.onNoPendingWrites = () {
     outputStream.close();
   };
 }