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This CL converts FuchsiaCdmProvider from fuchsia_cdm_provider.mojom to
new Mojo types using PendingReceiver and Remote.

Bug: 955171
Change-Id: Ica239f58ea2fed59098144d300f454d3e22cb5cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849748
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704959}