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Don't log io.ErrClosedPipe in proxy.

We expect one of these at the end of just about every proxy session, as
the Conns in both directions are closed as soon as the copy loop
finishes in one direction.

Closes #40016.
Status Job ID Name Coverage
  Test
passed #4216
android

00:11:34

passed #4219
debian-testing

00:08:25

passed #4217
go-1.13

00:02:25

passed #4218
go-1.14

00:02:40