Remove VideoSendStreamTest.ProducesStats.
Remove VideoSendStreamTest.ProducesStats.

This test is covered by EndToEndTests.GetStats and there's no need for a
duplicate test.

BUG=
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/39049004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@8332 4adac7df-926f-26a2-2b94-8c16560cd09d

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