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

src/workflow/ArcanistUploadWorkflow.php

@@ -74,10 +74,6 @@ EOTEXT
             'name' => $name,
             'contentLength' => $length,
             'contentHash' => $hash,
-
-            // TODO: Remove this once this feature is good to go. For now,
-            // this is helpful for testing.
-            // 'forceChunking' => true,
           ));
 
         $phid = $result['filePHID'];