In balanced adaptation mode, a 1280x720 feed would only ever be reduced in
resolution twice, and would never have its framerate reduced (due to an
interaction with MinFps()).
This change removes the hard limits entirely, instead relying only on
kMinFramerateFps and VideoEncoder::ScalingSettings::min_pixels_per_frame.
Deleted SinkWantsFromOveruseDetector test because it duplicates other tests.
Fixed DoesntAdaptDownPastMinFramerate; it wasn't testing what it claimed to
because it wasn't updating the fake clock correctly, meaning FPS was detected as
0, meaning framerate adaptation was never triggered.
Bug: webrtc:8068, b/38207842
Change-Id: If99d0e74c1334879c1b0c3117eb079f5f2139851
Reviewed-on: https://webrtc-review.googlesource.com/31644
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Commit-Queue: Jonathan Yu <yujo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#21312}
bc771b7585