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

Bug: 955171
Change-Id: I2bc25b4ed7a2a96feeb193ce70d496b86441d1fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1828663
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#700941}