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Encrypted media will require a different callback as there is a new attribute
in the returned type so a WebMediaCapabilitiesDecodingInfo will be introduced.
This change allows to cut a lot of boilerplate from the incoming CL.

Bug: 907909
Change-Id: I61f6296c4a35678b8d4054d3df703b74471b1afb
Reviewed-on: https://chromium-review.googlesource.com/c/1348258
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610682}