Update reference indices according to updates in the RTP payload profile.

https://tools.ietf.org/id/draft-ietf-payload-vp9-01.txt

BUG=chromium:500602

Review URL: https://codereview.webrtc.org/1406283008

Cr-Original-Commit-Position: refs/heads/master@{#10442}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 32df5efc6db394ff4c535c2049c079b8c0e31183
2 files changed