5f92051f063d5d827a16102d72cf1c23d423d3ec

The problem was that only ACKed packets were subtracted from in_flight_, but lost packets were never removed, which caused TCP to stop sending eventually. R=pbos@webrtc.org Review URL: https://webrtc-codereview.appspot.com/43239004 Cr-Commit-Position: refs/heads/master@{#9041}
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