Removed log from StatsCollector::GetTrackIdBySsrc.
Removed log from StatsCollector::GetTrackIdBySsrc.

Bug: chromium:906988
Change-Id: I353db16687e66c265a6121ee24e6353971d7884e
Reviewed-on: https://webrtc-review.googlesource.com/c/115120
Reviewed-by: Steve Anton <93f73658da16553b94c040887a439a155812e54e@webrtc.org>
Reviewed-by: Seth Hampson <5a50a6f73a991bd7236b2b9fd2e9f2207db14f62@webrtc.org>
Commit-Queue: Steve Anton <93f73658da16553b94c040887a439a155812e54e@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#26064}
TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc