Revert "Dartium JS Interop enabled."

tools/dom/templates/html/impl/impl_XMLHttpRequest.darttemplate

 // 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.
 
 part of $LIBRARYNAME;
 
  /**
   * A client-side XHR request for getting data from a URL,
   * formally known as XMLHttpRequest.
   *
@@ skipping 366 matching lines @@
       var value = header.substring(splitIdx + 2);
       if (headers.containsKey(key)) {
         headers[key] = '${headers[key]}, $value';
       } else {
         headers[key] = value;
       }
     }
     return headers;
   }
 
-  /**
-   * Specify the desired `url`, and `method` to use in making the request.
-   *
-   * By default the request is done asyncronously, with no user or password
-   * authentication information. If `async` is false, the request will be send
-   * synchronously.
-   *
-   * Calling `open` again on a currently active request is equivalent to
-   * calling `abort`.
-   *
-   * Note: Most simple HTTP requests can be accomplished using the [getString],
-   * [request], [requestCrossOrigin], or [postFormData] methods. Use of this
-   * `open` method is intended only for more complext HTTP requests where
-   * finer-grained control is needed.
-   */
-  @DomName('XMLHttpRequest.open')
-  @DocsEditable()
-$if JSINTEROP
-  void open(String method, String url, {bool async, String user, String password}) {
-    if (async == null && user == null && password == null) {
-      _blink.BlinkXMLHttpRequest.instance.open_Callback_2_(unwrap_jso(this), method, url);
-    } else {
-      _blink.BlinkXMLHttpRequest.instance.open_Callback_5_(unwrap_jso(this), method, url, async, user, password);
-    }
-  }
-$else
-  void open(String method, String url, {bool async, String user, String password}) native;
-$endif
-
 $!MEMBERS
 }