Summary: Ref T12616. This class is already mostly-reasonable as a representation of an individual changeset, so I plan to just adjust it a little bit.
Test Plan:
- Used `git grep` to search for `ChangesetViewManager`.
- Used `git grep` to search for `changeset-view-manager`.
- Browsed around and interacted with changesets.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T12616
Differential Revision: https://secure.phabricator.com/D17842
