Re: [streams] Merge ReadableByteStream into ReadableStream (#430)

Self-reply to https://github.com/whatwg/streams/pull/430#issuecomment-193877949

> So, IIUC, TCPSocketPosix::SetReceiveBufferSize() would help us prevent / recover from unexpected increase of amount of data being buffered in kernel.

SO_RCVBUF limits total memory consumption including overhead. So, this value should be set to a slightly larger value (e.g. like tcp_adv_win_scale is reflected to the advertised window size).

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