Summary:
These are all unambiguously unextensible. Issues I hit:
- Maniphest Change/Diff controllers, just consolidated them.
- Some search controllers incorrectly extend from "Search" but should extend from "SearchBase". This has no runtime effects.
- D1836 introduced a closure, which we don't handle correctly (somewhat on purpose; we target PHP 5.2). See T962.
Test Plan: Ran "testEverythingImplemented" unit test to identify classes extending from `final` classes. Resolved issues.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran, epriestley
Maniphest Tasks: T795
Differential Revision: https://secure.phabricator.com/D1843
