http: Client test for streaming responses (no code changes)
http: Client test for streaming responses (no code changes)

I had a report that this was broken. It seems fine.

I think the reporter was just never flushing their response
headers.  If I omit the test server's initial Flush I get the
same behavior as reported. (a hang at Client.Get)

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/4552062

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