Test of packet loss used a simplified calculation of lost packets and
loss ratio. Changed the calculation to be more accurate. This protects
against triggering for future implementations with more precise
calculations.
Bug: webrtc:8415
Change-Id: I721dc83954e8738fdf8ea729dee4cc8b8c8fa091
Reviewed-on: https://webrtc-review.googlesource.com/46740
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21845}