chromium: prevent automatic Widevine DRM download

Previously, chromium automatically downloaded Widevine via its
component updater when encountering DRM protected content for the first
time or when manually opening chrome://components.

This commit disables that and also prevents previously downloaded
Widevine blobs (usually in ~/.config/chromium/WidevineCdm/) from being
loaded and executed.

Widevine now only works using
~~~
chromium.override { enableWideVine = true; }
~~~
making Widevine truly opt-in, as it's supposed to be.
Using that override also sets meta.license to unfree, making the
end user aware that Widevine is in fact unfree.

See issue 115275 for further details.

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