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This CL cleans up VRServiceClientRequest that is left in only
FakeVRServiceClient class with the conversion to new mojo types.

Bug: 955171
Change-Id: I1ce8923b4115d98fc84c69da64cb8b28d7a2f05c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1828719
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#700944}