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Revert "Have DifferentialRevisionList return an ObjectBox if header is set"

Authored by epriestley <git@epriestley.com> on Feb 3 2015, 21:16.

Description

Revert "Have DifferentialRevisionList return an ObjectBox if header is set"

This did bad things to dashboards, pulling it back until we have a more complete fix.

This reverts commit 468985c8275e80a0585298d2763fe363473054cf.

Auditors: chad