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This change deletes a bunch of TMP that was required during the big
arc::ConnectionHolder refactoring of 2017.

Bug: 750563
Test: build
Change-Id: Ibe6eaf55965a488855a9b306f1d79caff57646a3
Reviewed-on: https://chromium-review.googlesource.com/1253501Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Luis Hector Chavez <lhchavez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595385}