Minor cleanups following WebExposedIsolationInfo simplification.

- IsSiteInstanceCompatibleWithWebExposedIsolation takes in a
WebExposedIsolationInfo instead of a UrlInfo, as it is not using other
members of UrlInfo anymore.
- RenderFrameHostImpl::IsNavigationSameSite() already does a
WEII::AreCompatible check,
IsSiteInstanceCompatibleWithWebExposedIsolation is redundant.

Bug: 1243449
Change-Id: Idafcc641a5779ed5d709e53276c565246e886241
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3348612
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Arthur Hemery <ahemery@chromium.org>
Cr-Commit-Position: refs/heads/main@{#954937}