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This CL fixes the undesirable behavior where manually enabling
password site isolation from chrome://flags didn't take effect if the
user's device was below the site isolation memory threshold.  The same
also affected strict origin isolation, which is also fixed.  (Strict
site isolation and IsolateOrigins are not affected because they map to
cmdline switches rather than base::Features.)

Bug: 1009828
Change-Id: Ibdfbca5ed1e2216e347e15a18c71ceaeafe2da03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845667
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704496}