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This change removes all WebVr flags and almost all WebVr blink code.
Future work will begin to remove the device side WebVr code, and then
mojo refactors will be investigated.

Bug: 960132
Change-Id: I3e14b6f20b43c0580a39c0692be1d657ea00ab0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869673
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708905}