Refactor removeRange.

sdk/lib/io/http_headers.dart

 // Copyright (c) 2013, 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.
 
 part of dart.io;
 
 class _HttpHeaders implements HttpHeaders {
   _HttpHeaders(String this.protocolVersion)
       : _headers = new Map<String, List<String>>();
 
@@ skipping 30 matching lines @@
     add(name, value);
   }
 
   void remove(String name, Object value) {
     _checkMutable();
     name = name.toLowerCase();
     List<String> values = _headers[name];
     if (values != null) {
       int index = values.indexOf(value);
       if (index != -1) {
-        values.removeRange(index, 1);
+        values.removeRange(index, index + 1);
       }
       if (values.length == 0) _headers.remove(name);
     }
   }
 
   void removeAll(String name) {
     _checkMutable();
     name = name.toLowerCase();
     _headers.remove(name);
   }
@@ skipping 700 matching lines @@
 
   String name;
   String value;
   DateTime expires;
   int maxAge;
   String domain;
   String path;
   bool httpOnly = false;
   bool secure = false;
 }