Simplify timeline rendering on Differential revisions
Summary: Ref T7447. Remove the loadInlineComments() by-ref side-effect mess and make this load more direct.
Test Plan:
- Viewed a revision.
- Clicked "Show Older".
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T7447
Differential Revision: https://secure.phabricator.com/D12496