WebPageProxyIdentifier parameter of WebPageProxy::CreateNewPage() should not be Optional. The method extracts the value of Optional<WebPageProxyIdentifier> unconditionally, so it's clear it doesn't need to be Optional<>. <rdar://problem/65768644>
Created attachment 404695 [details] Patch v1
Committed r264602: <https://trac.webkit.org/changeset/264602> All reviewed patches have been landed. Closing bug and clearing flags on attachment 404695 [details].