FLEDGE: Restore backwards compat on null on our Promise params
...after Chrome's WebIDL impl tightened up checking on those[1]
(and pointed out that our spec is wrong on these, will work to
update it after this CL).
I am unsure as to what to do with resolvedToConfig, though; the
behavior of it is very non-JS-like.
[1] See https://chromium-review.googlesource.com/c/chromium/src/+/5381805
Change-Id: I92abd0bf34601333064b9e1c5b4a21ea4068754f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5907125
Reviewed-by: Qingxin Wu qingxinwu@google.com
Commit-Queue: Maks Orlovich morlovich@chromium.org
Cr-Commit-Position: refs/heads/main@{#1364237}