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ChannelMac is now the default Mojo channel implementation, and the
feature condition between it and ChannelPosix can be removed. This
removes the now-dead code for manipulating the UNIX domain socket app
shims used to connect with over ChannelPosix.

Bug: 973882
Change-Id: I67ffa068c814c459002e63c587225394d072271f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1677286
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#673723}