This avoid sending more padding than required for the current target constraints. Bug: webrt:8415 Change-Id: I3a668990f026414ab78f8406248cde18b81123cc Reviewed-on: https://webrtc-review.googlesource.com/77763 Commit-Queue: Sebastian Jansson <srte@webrtc.org> Reviewed-by: Björn Terelius <terelius@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23364}