While reviewing feature flag state, we noticed that 'PushAPIEnabled' is testable (and off-by-default). It should instead be an `embedder` flag.
<rdar://problem/108375647>
Pull request: https://github.com/WebKit/WebKit/pull/13038
Committed 263267@main (e07c0d836e7a): <https://commits.webkit.org/263267@main> Reviewed commits have been landed. Closing PR #13038 and removing active labels.