User::isBlocked, User::isBlockedFrom, User::blockedFor were soft deprecated and now need to be hard deprecated. So we need to remove using from the extensions and skins:
**WMF deployed**
[x] extensions / Wikibase
[x] extensions / CodeReview
[x] extensions / UrlShortener
[x] extensions / OAuth
[x] extensions / VisualEditor
[x] extensions / Renameuser
[x] extensions / NewUserMessage
[x] extensions / GWToolset
[x] extensions / Babel
**not WMF deployed**
[x] extensions / SocialProfile
[x] extensions / Survey
[x] extensions / ArticleFeedbackv5
[x] extensions / WikiLexicalData
[x] extensions / Comments
[x] extensions / PollNY
[x] extensions / RegexBlock
[x] extensions / LinkFilter
[x] extensions / UserStatus
[x] extensions / EditAccount
[x] extensions / MassEditRegex
[x] extensions / MediaWikiChat
[x] extensions / Report
[x] extensions / Translate
[x] extensions / BlogPage
[x] extensions / BlueSpiceEchoConnector
[x] extensions / InteractiveBlockMessage
[x] extensions / Challenge
[x] extensions / GraphViz
[x] extensions / HAWelcome
[x] extensions / ImportFreeImages
[x] extensions / LastUserLogin
[x] extensions / LDAPSyncAll
[x] extensions / Maintenance
[x] extensions / NewUserActions
[x] extensions / PageForms
[x] extensions / Patroller
[x] extensions / Petition
[x] extensions / Poll
[x] extensions / PrivateDomains
[x] extensions / QuizGame
[x] extensions / RefreshSpecial
[x] extensions / RevisionCommentSupplement
[x] extensions / SiteSettings
[x] extensions / TinyMCE
[x] extensions / WikiForum
[x] extensions / Form
[] extensions / ConfirmAccount
[x] skins / Nimbus