Although urlSchemesRegisteredAsLocal, urlSchemesRegisteredAsNoAccess, urlSchemesRegisteredAsDisplayIsolated and urlSchemesRegisteredAsCORSEnabled are correctly dealt with in WebProcessCreationParameters and there are methods to register them in WebProcess, those are not called on initializeWebProcess so in case of e.g. a crash, when the web process is relaunched again, these schmes do not get registered. It is an easy fix and I'll upload a patch very soon.
Created attachment 177508 [details] Patch
Comment on attachment 177508 [details] Patch Clearing flags on attachment: 177508 Committed r136650: <http://trac.webkit.org/changeset/136650>
All reviewed patches have been landed. Closing bug.