Remove PhabricatorPHID::fromObjectName
Summary: Ref T2715. This only ever supported like 10% of object types; get rid of it in favor of the new infra.
Test Plan:
- Ran bin/search index D12; bin/search index <some valid phid>, bin/search index derp.
- Turned off Search jump, searched for D12.
- Used phid.lookup.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2715
Differential Revision: https://secure.phabricator.com/D6519