Removing FEC functionality from the default RTP module.

This CL removes the last default module methods used from ViEEncoder and
the default module itself will be removed in a separate CL.

BUG=769
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/35309004

Cr-Original-Commit-Position: refs/heads/master@{#8505}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 96abda0316312183307a0c95e9417f10eab7e05b
13 files changed