[hack] Removing "malformed preamble" check, two years on
[hack] Removing "malformed preamble" check, two years on

Summary: This was a "TODO: remove this" long past due...!

Reviewed By: alexchow

Differential Revision: D4968645

fbshipit-source-id: 5408d7918e00317c87bb21f9881fd8d7cf916b01

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