Fix static type errors in a number of tests

sdk/lib/io/http.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;
 
 /**
  * HTTP status codes.
  */
 abstract class HttpStatus {
@@ skipping 375 matching lines @@
 
   /**
    * Gets and sets the content length header value.
    */
   int contentLength;
 
   /**
    * Gets and sets the persistent connection header value.
    */
   bool persistentConnection;
+
+  /**
+   * Gets and sets the chunked transfer encoding header value.
+   */
+  bool chunkedTransferEncoding;
 }
 
 
 /**
  * Representation of a header value in the form:
  *
  *   [:value; parameter1=value1; parameter2=value2:]
  *
  * [HeaderValue] can be used to conveniently build and parse header
  * values on this form.
@@ skipping 909 matching lines @@
 class RedirectLimitExceededException extends RedirectException {
   const RedirectLimitExceededException(List<RedirectInfo> redirects)
       : super("Redirect limit exceeded", redirects);
 }
 
 
 class RedirectLoopException extends RedirectException {
   const RedirectLoopException(List<RedirectInfo> redirects)
       : super("Redirect loop detected", redirects);
 }