Remove old WebRTC-NewVideoJitterBuffer used for testing the NackModule.

This experiment was used to test the NackModule but will soon (tm) be used to
test the completly new video jitter buffer.

BUG=webrtc:5514
R=stefan@webrtc.org

Review URL: https://codereview.webrtc.org/2123913002 .

Cr-Original-Commit-Position: refs/heads/master@{#13395}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 8513029e1f06804f99d57affc42bf945546d28c4
6 files changed