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We no longer have mash vs. classic configs in ash, and there's only one
implementation of ShellPort. As a step towards eliminating ShellPort,
remove the object factory methods from it.

Keep CreatePointerWatcherAdapter for now because that will require
more general PointerWatcher cleanup.

Bug: 866523
Test: ash_unittests
Change-Id: Iff2c3898932389ebc7eeb253ca4eb046da35e641
Reviewed-on: https://chromium-review.googlesource.com/1157688
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579683}