This was forgotten in https://codereview.webrtc.org/1694813002/ Also clean up no-longer-used files for libjignle_unittest (renamed to rtc_unittests a long time ago). BUG=webrtc:5419 TBR=pbos@webrtc.org Review URL: https://codereview.webrtc.org/1698123002 . Cr-Commit-Position: refs/heads/master@{#11625}