Frederik Braun 30828a6a49 Bug 1754301 - remove pref security.csp.enable r=ckerschb,mccr8
This removes the pref `security.csp.enable` and amends various callers
in dom/, which no longer have to take this pref into consideration.

Furthermore, we can remove the test in dom/base/test/browser_bug593387.js
The test used the pref to test that external content can be embedded into
about:plugins, which is historic baggage from a previous architecture of
said page that we no longer require. It's also an anti-pattern that we
do not want to support any longer. In fact, the test had to jump through
additional hoops to make that work at all.

Differential Revision: https://phabricator.services.mozilla.com/D138661
2022-02-15 16:03:27 +00:00
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