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Move the handling of the Content-Length to the HttpHeaders object. This makes it possible to set the Content-Length through the headers as well as directly on HttpResponse and HttpClientRequest. R=ajohnsen@google.com BUG= Review URL: https://codereview.chromium.org//11637017 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@16357 260f80e4-7a28-3924-810f-c04153c831b5