Remove "force chunking" code from Arcanist
Remove "force chunking" code from Arcanist

Summary: Ref T7149. This was just for testing and is no longer required.

Test Plan: `grep`

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7149

Differential Revision: https://secure.phabricator.com/D12077

julkiewicz/arcanist,julkiewicz/arcanist,julkiewicz/arcanist,julkiewicz/arcanist