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This CL converts BlobRequest to new Mojo types.
It updates Clone from blob.mojom and Register
and GetBlobFromUUID from blob_registry.mojom and
methods and members to implement them.

It cleans up unnecessary BlobRequest declarations,
as well.

Bug: 955171, 978694
Change-Id: I4d2599341445a50af92e7c09245981b6939003ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1757605
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690264}