Update remaining usages of Completer.completeException.

tools/html_json_doc/lib/html_to_json.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 extracting the documentation comments from files generated by
  * the HTML library. The comments are stored in a JSON file.
  *
  * Comments must be in either the block style with leading *s:
  *
@@ skipping 40 matching lines @@
     var outputStream = jsonFile.openOutputStream();
     outputStream.writeString(prettyPrintJson(writeJson));
 
     outputStream.onNoPendingWrites = () {
       completer.complete(_anyErrors);
     };
 
     outputStream.onClosed = () {
       completer.complete(_anyErrors);
     };
-    
-    outputStream.onError = completer.completeException;
+
+    outputStream.onError = completer.completeError;
   });
 
   return completer.future;
 }
 
 
 /**
  * Convert all files on [htmlPath].
  *
  * Returns a future that completes to the converted JSON object.
@@ skipping 235 matching lines @@
         '${prettyPrintJson(json[key], '$indentation  ')}');
     var recursiveOutput = Strings.join(mapList, ',\n');
     output = '$indentation{\n'
       '$recursiveOutput'
       '\n$indentation}';
   } else {
     output = '$indentation${JSON.stringify(json)}';
   }
   return output;
 }