gs_archive_server: add content-length header to extract rpc

BUG=chromium:1143435
TEST=Tested manually. Details http://gpaste/5452986865156096

Change-Id: I4eb2f858d6498e6fd3aa67ad413553837631f0d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2538137
Tested-by: Sanika Kulkarni <sanikak@chromium.org>
Reviewed-by: Allen Li <ayatane@chromium.org>
Reviewed-by: Congbin Guo <guocb@chromium.org>
Commit-Queue: Sanika Kulkarni <sanikak@chromium.org>
Auto-Submit: Sanika Kulkarni <sanikak@chromium.org>
1 file changed