Rewrite DartHtmlHttpService to not use HttpRequest.request().
Rewrite DartHtmlHttpService to not use HttpRequest.request().

google/streamy-dart,srawlins/streamy-dart,ronlobo/streamy-dart,ronlobo/streamy-dart,google/streamy-dart,ronlobo/streamy-dart,google/streamy-dart,google/streamy-dart,srawlins/streamy-dart,srawlins/streamy-dart,ronlobo/streamy-dart,srawlins/streamy-dart