Adopt enum class for AutocapitalizeType. Also add missing WebCore namespace to the enum, and create EnumTraits<> for IPC.
<rdar://problem/64042825>
Created attachment 401194 [details] Patch v1
Comment on attachment 401194 [details] Patch v1 Windows layout test failure is unrelated, so marking as cq+.
Committed r262665: <https://trac.webkit.org/changeset/262665> All reviewed patches have been landed. Closing bug and clearing flags on attachment 401194 [details].