IPC::Decoder::isValid() should just be a nullptr check.
<rdar://problem/62552699>
Created attachment 397905 [details] Patch v1
Comment on attachment 397905 [details] Patch v1 Marking cq+ since this code isn't compiled/used on the Windows port, which is reporting tentative layout test failures.
Committed r260861: <https://trac.webkit.org/changeset/260861> All reviewed patches have been landed. Closing bug and clearing flags on attachment 397905 [details].