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This removes one entry of the ServerConnectionCode enum which is unused,
and removes an obsolete TODO.

Bug: none
Change-Id: I19a6653d30fc8f6c2bfd7d7d45c6a7a57f6f0473
Reviewed-on: https://chromium-review.googlesource.com/c/1290951Reviewed-by: vitaliii <vitaliii@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601118}