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According to the current program flow, this to-be-removed branch seems a
useless special handling.

This CL might affect how UserSessionManager utilitzes tpm manager client
in the near future.

BUG=b:172748724
TEST=unittests.

Change-Id: I93f05a45409878db1138c8d49d835f1d7f0c427e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2525471Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Leo Lai <cylai@google.com>
Cr-Commit-Position: refs/heads/master@{#826319}