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Collect scattered implementations of "getDisplayHash()" into RepositoryAPI

Description

Collect scattered implementations of "getDisplayHash()" into RepositoryAPI

Summary: Ref T13546. All of LandEngine, LocalState, and RepositoryAPI implement "getDisplayHash()". Always use the RepositoryAPI implementation.

Test Plan: Grepped for symbols.

Maniphest Tasks: T13546

Differential Revision: https://secure.phabricator.com/D21353