Removed getElementsByClassName in repositor-crossreference.js
Summary: Used JX.DOM.scry() to locate blocks.
Test Plan: I made the necessary changes, differential is loading diffs as usual. Let me know if I have done it correctly.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin, AnhNhan
Maniphest Tasks: T3007
Differential Revision: https://secure.phabricator.com/D5887
Conflicts:
src/__celerity_resource_map__.php
Conflicts:
src/__celerity_resource_map__.php