Lots of uses
https://codesearch.wmflabs.org/deployed/?q=Revision%3A%3AnewFromId&i=nope&files=&repos=
- Core
- Wikibase
- FlaggedRevs
- Flow
- CheckUser
- EventLogging
- LiquidThreads
- MobileFrontend
- Translate
- Cognate
- Jade
- Newsletter
- ParsoidBatchAPI
Remaining core uses:
- EditPage
- MediaWiki.php
- WikiPage::replaceSectionAtRev
- CheckBadRedirects
- ImportTextFiles