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Replaces uses of Blink MessagePort/MessageChannel with
cast_api_bindings::MessagePort.

Updates Fuchsia and Cast tests to use the new
cast_api_bindings::MessagePort API.

Removes Mojo and Blink deps.

Bug: 1131102,1126571
Change-Id: Ib4f2da74d03dcbae9f271f5a2f7c069d8e9f0e3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2458877
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815831}