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Before this CL tpm_challenge_key_unittest.cc contained tests for
TpmChallengeKey, TpmChallengeKeySubtle and TpmChallengeKeyResult.
Now it will test only TpmChallengeKey, other parts are separated
into their own test sets (in previous CL).

Bug: 1090723
Test: TpmChallenge*
Change-Id: I66aa20a6d69e77a2865b77bacc819d0be61756d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228555
Commit-Queue: Michael Ershov <miersh@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797252}