Pull specialized file existence test, faster than EFSSessionCopyFileInfo.
Pull specialized file existence test, faster than EFSSessionCopyFileInfo.

yamingd/stronglink,yamingd/stronglink,feld/stronglink,btrask/stronglink,guiquanz/stronglink,yamingd/stronglink,Lacra17/stronglink,guiquanz/stronglink,Ryezhang/stronglink,shaunstanislaus/stronglink,Ryezhang/stronglink,rmoorman/stronglink,rmoorman/stronglink,btrask/stronglink,guiquanz/stronglink,nkatsaros/stronglink,nkatsaros/stronglink,iOSCowboy/stronglink,iOSCowboy/stronglink,btrask/stronglink,shaunstanislaus/stronglink,btrask/stronglink,rmoorman/stronglink,shaunstanislaus/stronglink,nkatsaros/stronglink,Lacra17/stronglink,Ryezhang/stronglink,feld/stronglink,iOSCowboy/stronglink,Lacra17/stronglink,feld/stronglink