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Well, there is no such folder anymore.
since the whole design & structure of application server changed with version 7.
However for serving static content you have similar folder in WILDFLY_HOME/welcome-content
which out of the box servers http://localhost:8080/ if you don't change anything.
but I would recommend you to take a look at undertow subsystem in standalone.xml
Configure new file-handler and to server from whatever folder you have on disk for static content.
Than just map that newly added file-handler to any context you want.
To add to Tomaz , undertow is the new webserver for the wildfly if that was your question .