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The package is not available by default on some Googler machines, and it
was easy to remove.

The only client was //media/tools/constrained_network_server/cns.py,
which will now get cherrypy via vpython

Bug: None
Change-Id: If5dc02601691b68c0b6161cbf904837766a3e9ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159406
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761055}