Review Mozilla 1982032: Add LoadURIOption to force loading as a MediaDocument

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Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1982032

Description

It conflicts with our patch to netwerk/protocol/http/HttpBaseChannel.cpp in f2a6f958.

While the change seems simple (replace aContentPolicyType with contentPolicyType), does it even make sense to keep this part of that patch?

Maybe we can dump it.

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