Bug 246898 adds an IPC coder for WTF::EnumeratedArray, which FEComponentTrasfer is using as of bug 246602. Let's use it to simplify FEComponentTransfer's encode/decoder functions.
<rdar://problem/101464975>
Pull request: https://github.com/WebKit/WebKit/pull/5694
Committed 255906@main (355426c15db9): <https://commits.webkit.org/255906@main> Reviewed commits have been landed. Closing PR #5694 and removing active labels.