chore: cherry-pick c244270e23 from chromium. #26477
Ignore RenderFrameHostImpl::Detach() for speculative RFHs.
Currently, this all happens to work by chance, because the speculative
However, there are a number of followup CLs that restructure how
(cherry picked from commit cf054220a2e1570a9149220494de8826c2e9d4db)
Notes: Backported the fix to CVE-2020-16017: Browser UAF when detaching a provisional frame.
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