Finally, Apple-style-span class was fully removed from Blink(commit).
Apple-style-span has not been produced since 2011: https://webkit.org/blog/1737/apple-style-span-is-gone, but there were still some legacy code to handle Apple-style-span class because old WebKit engines has produced it, but now the usage is quite low(<=0.0001%). So, we decided to remove it from Blink at the last BlinkOn7. The code were executed whenever the users copy text or run Editing APIs(document.execCommand) to change the styles. Other non-standard CSS classes(Apple-interchange-newline, Apple-converted-space, Apple-paste-as-quotation) will be also removed soon if possible.
Anyway, I feel that editing in Chromium is a bit faster :P