Make SourceBufferChangeTypeEnabled on by default
<rdar://43388272>
Created attachment 349478 [details] Patch
Created attachment 349601 [details] Patch
Comment on attachment 349601 [details] Patch Clearing flags on attachment: 349601 Committed r236010: <https://trac.webkit.org/changeset/236010>
All reviewed patches have been landed. Closing bug.