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Encryption keys can contain non-utf8 binary content and are better
represented by ArrayBuffer being adopted in the API.

The patch also reorders the parameter order for future expansion
options.

Bug: 1000146
Change-Id: I7d1da9320c7e5c512f657deb5b211d3cf46d06d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919935
Commit-Queue: David Trainor <dtrainor@chromium.org>
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718313}