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Now that the ShouldRFP member is correctly populated (we hope)
in CookieJarSettings, we can use it in our ShouldRFP methods.
There are two general scenarios:
An exempted domain frames a non-exempted domain.
The inner frame should be non-exempted.
A non-exempted domain frames an exempted domain
The inner frame should be non-exempted.
In the first scenario, CookieJarSettings.shouldRFP member
will be false (exempted.) We clearly cannot blindly rely
on the member, it would be wrong here.
In the second scenario, CookieJarSettings.shouldRFP member
will be true (non-exempted). This is the scenario we really
need CookieJarSettings for.
----
We take the opportunity to add an additional check for the
'exempted domain framed by a non-exempted domain' scenario.
This additional check takes advantage of the first party
isolation key (for FPI) or partition key (for dFPI).
Differential Revision: https://phabricator.services.mozilla.com/D150589
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