R1:d44f05eead96

Clean up some more handle callsites

Summary: Ref T7689.

Test Plan:
- Viewed Calendar browse and detail views.
- Went through Differential update workflow.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7689

Differential Revision: https://secure.phabricator.com/D12341