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This is a reland of d7213e95

The change of replacing vr_service.mojom-blink.h with vr_service.mojom-blink-forward.h
in third_party/blink/renderer/modules/xr/type_converters.h had caused the build break.
This re-land CL restores vr_service.mojom-blink.h in type_converters.h.

Original change's description:
> Replace .mojom-blink.h with .mojom-blink-forward.h in blink - 13
>
> To reduce pre-processed size of header files have been including
> foo.mojom-blink.h, this CL replaces .mojom-blink.h with
> .mojom-blink-forward.h in blink header files.
>
> This CL has no behavior changes and following CLs will
> continue replacing them more.
>
> Bug: 1001360
> Change-Id: I42c62234c64878d23057366df8823eb94a8a5e6e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1852354
> Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
> Reviewed-by: Kent Tamura <tkent@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#705021}

Bug: 1001360
Change-Id: I8d85c338de234922dbce52c8802688e2ae3888fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1855550
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705878}