Remove the size limit on arc side
Remove the size limit on arc side

Summary:
remove the size check. The conduit call will fail later if the
size is too large, and we will get better error message.

Test Plan:
run arc diff with files smaller and larger than the size
limit.

Reviewed By: epriestley
Reviewers: epriestley
CC: aran, epriestley
Differential Revision: 729

wxstars/arcanist,aik099/arcanist,coursera/arcanist,Symplicity/arcanist,alexmv/arcanist,calblueprint/arcanist,uber/arcanist,codelabs-ch/arcanist,Khan/arcanist,coursera/arcanist,eSpark/arcanist,chundongwang/arcanist,hach-que/arcanist,haskell-infra/arcanist,eSpark/arcanist,phacility/arcanist,wharris/arcanist,r4nt/arcanist,Symplicity/arcanist,kevinseelbach/arcanist,dguo-coursera/arcanist,eSpark/arcanist,fivestars/arcanist,r4nt/arcanist,sneakpeeq/arcanist,fivestars/arcanist,alexmv/arcanist,calblueprint/arcanist,eSpark/arcanist,kevinseelbach/arcanist,aik099/arcanist,kevinseelbach/arcanist,julkiewicz/arcanist,folsom-labs/arcanist,chundongwang/arcanist,wharris/arcanist,calblueprint/arcanist,Khan/arcanist,KieranHayes/arcanist,julkiewicz/arcanist,kevinseelbach/arcanist,hach-que/arcanist,coursera/arcanist,sneakpeeq/arcanist,dguo-coursera/arcanist,Symplicity/arcanist,codelabs-ch/arcanist,aik099/arcanist,haskell-infra/arcanist,wharris/arcanist,wxstars/arcanist,codelabs-ch/arcanist,calblueprint/arcanist,Khan/arcanist,julkiewicz/arcanist,uber/arcanist,memsql/arcanist,sneakpeeq/arcanist,folsom-labs/arcanist,KieranHayes/arcanist,wxstars/arcanist,wikimedia/phabricator-arcanist,jra3/arcanist,chundongwang/arcanist,PageUpPeopleOrg/arcanist-patches,zhihu/arcanist,memsql/arcanist,jra3/arcanist,memsql/arcanist,r4nt/arcanist,wikimedia/phabricator-arcanist,zhihu/arcanist,KieranHayes/arcanist,folsom-labs/arcanist,r4nt/arcanist,wharris/arcanist,codelabs-ch/arcanist,alexmv/arcanist,fivestars/arcanist,codelabs-ch/arcanist,julkiewicz/arcanist,sneakpeeq/arcanist,phacility/arcanist,alexmv/arcanist,dguo-coursera/arcanist,KieranHayes/arcanist,wikimedia/phabricator-arcanist,folsom-labs/arcanist,coursera/arcanist,uber/arcanist,PageUpPeopleOrg/arcanist-patches,memsql/arcanist,jra3/arcanist,chundongwang/arcanist,Khan/arcanist,PageUpPeopleOrg/arcanist-patches,wxstars/arcanist,fivestars/arcanist,dguo-coursera/arcanist,jra3/arcanist,zhihu/arcanist,zhihu/arcanist,uber/arcanist,Symplicity/arcanist,hach-que/arcanist,haskell-infra/arcanist,aik099/arcanist,PageUpPeopleOrg/arcanist-patches,phacility/arcanist,phacility/arcanist,phacility/arcanist,wikimedia/phabricator-arcanist,haskell-infra/arcanist,hach-que/arcanist