Webkit: Revert unneeded commit

Summary:
This reverts commit d32085cc25faa7c86e310bd080fa4b2fed7f8005.

This commit is no longer necessary due to LTO globally enabled

Test Plan: apply all patches and win

Reviewers: randall.rushing, Mustaavalkosta, Roach, rlasalle15, synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D240