Clean up storage of FlexFEC payload type in webrtc::VideoCodecSettings.

No need to pass a whole struct around, when only one member is used.

BUG=webrtc:5654

Review-Url: https://codereview.webrtc.org/2589833002
Cr-Original-Commit-Position: refs/heads/master@{#15687}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: bb7066f9662a638f2f3b2f6100880ca595da0c3c
2 files changed