make explicit that modules for existing files always have providers
make explicit that modules for existing files always have providers

Summary: Remove a dead branch in calc_old_modules

Reviewed By: mroch

Differential Revision: D4664580

fbshipit-source-id: c9f734df2a60bc243e1c1c0f91cf31c73710b70d

gabelevi/flow,JonathanUsername/flow,claudiopro/flow,fletcherw/flow,jamesgpearce/flow,nmote/flow,gabelevi/flow,gabelevi/flow,samwgoldman/flow,facebook/flow,nmote/flow,samwgoldman/flow,TiddoLangerak/flow,popham/flow,mroch/flow,mroch/flow,JonathanUsername/flow,MichaelDeBoey/flow,JonathanUsername/flow,facebook/flow,nmote/flow,samwgoldman/flow,popham/flow,samwgoldman/flow,mroch/flow,fletcherw/flow,TiddoLangerak/flow,nmote/flow,gabelevi/flow,AgentME/flow,ylu1317/flow,mroch/flow,ylu1317/flow,JonathanUsername/flow,gabelevi/flow,jamesgpearce/flow,jamesgpearce/flow,samwgoldman/flow,gabro/flow,mroch/flow,fletcherw/flow,jamesgpearce/flow,facebook/flow,popham/flow,ylu1317/flow,ylu1317/flow,AgentME/flow,jamesgpearce/flow,MichaelDeBoey/flow,gabro/flow,gabro/flow,fletcherw/flow,claudiopro/flow,JonathanUsername/flow,TiddoLangerak/flow,TiddoLangerak/flow,jamesgpearce/flow,nmote/flow,claudiopro/flow,ylu1317/flow,popham/flow,samwgoldman/flow,JonathanUsername/flow,facebook/flow,AgentME/flow,nmote/flow,fletcherw/flow,JonathanUsername/flow,gabelevi/flow,TiddoLangerak/flow,MichaelDeBoey/flow,nmote/flow,claudiopro/flow,MichaelDeBoey/flow,gabro/flow,AgentME/flow,AgentME/flow,fletcherw/flow,facebook/flow,facebook/flow,facebook/flow,gabelevi/flow,MichaelDeBoey/flow,mroch/flow,popham/flow,claudiopro/flow,popham/flow,gabro/flow,jamesgpearce/flow,gabro/flow,mroch/flow,popham/flow,samwgoldman/flow