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Removes the code for using the VrCore-side fake head tracking service
in VR tests. This functionality was added a long time ago, but never
actually used because enabling it caused VrCore to crash randomly.

Equivalent functionality has been around on Chrome's end for a while.

Bug: 931414
Change-Id: Icb7c4931b177d1357368add1e915103bfeaef71e
Reviewed-on: https://chromium-review.googlesource.com/c/1471511Reviewed-by: Klaus Weidner <klausw@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632756}