There are runtimes for NaCL, pNaCL, Flash, there's a PDF browser (some of these are plugins)
Really? While Chrome has all of those built in, the other WebKit browsers don't so why would it be in the WebKit source tree (especially after the mutual purges of the Blink/WebKit split.)
Also, all of those (except maybe the PDF viewer) in Chrome are plugins, and they are PPAPI (which was Chromium specific, not used by other WebKit browsers) not NPAPI plugins, and Flash and maybe the PDF viewer aren't bundled with Chromium (just Chrome) so its really weird that anything related to them would remain in WebKit.
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Really? While Chrome has all of those built in, the other WebKit browsers don't so why would it be in the WebKit source tree (especially after the mutual purges of the Blink/WebKit split.)
Also, all of those (except maybe the PDF viewer) in Chrome are plugins, and they are PPAPI (which was Chromium specific, not used by other WebKit browsers) not NPAPI plugins, and Flash and maybe the PDF viewer aren't bundled with Chromium (just Chrome) so its really weird that anything related to them would remain in WebKit.
You're right, I mixed up WebKit and Chrome there.