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This change removes the "is_legacy_webvr" attribute from the mojom files
that used it, since this is now always false.  Any logic that depended
on it has been updated accordingly.

Note that the "IsLegacyWebVr" metric is still being logged to prevent
incompatiabilities with the data types while it is a value that is
needed for filters.

Bug: 1017872
Change-Id: Ie43c914a4bbac0c1b7beda02257865ac3e69f5ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1897857
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712854}