The WebContent, Network, and Storage processes should not have access to the LaunchServices 'openURL' feature, since opening URL's is the responsibility of the UIProcess, which does the relevant work.
<rdar://problem/39686511>
Created attachment 341034 [details] Patch
Also tested manually on iOS.
Comment on attachment 341034 [details] Patch rs=me
Comment on attachment 341034 [details] Patch Thank you for reviewing!
Comment on attachment 341034 [details] Patch Clearing flags on attachment: 341034 Committed r232097: <https://trac.webkit.org/changeset/232097>
All reviewed patches have been landed. Closing bug.