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DBusThreadManagerLinux will be used on Chrome OS to create an
alternate set of DBus clients. Renames the file in preparation of this.

TBR=avi@chromium.org, michaelpg@chromium.org

Bug: 882771
Change-Id: I953fb4bfcc0b3faf0b68fba5f0c18b248f6072f6
Reviewed-on: https://chromium-review.googlesource.com/1238097
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Sonny Sasaka <sonnysasaka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593762}