Fix issue where receive-side encoders are included in the padding bitrate.

BUG=chromium:487528
R=tnakamura@webrtc.org, mflodman@webrtc.org
TBR=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/49959004

Cr-Commit-Position: refs/heads/master@{#9185}
(cherry picked from commit 070376697a4eea6d0c7f030b4553bcb9e2948474)

Review URL: https://webrtc-codereview.appspot.com/52489004

Cr-Commit-Position: refs/branch-heads/43@{#11}
Cr-Branched-From: 7351f4689caae2e53b3ee54874546e8aab769d22-refs/heads/master@{#8926}
2 files changed