Lower SSIM thresholds.

VP9 SSIM slightly decreased with the latest libvpx.

Bug: webrtc:10348
Change-Id: I255e3b36751979c3226222caae7fca7bd837901e
Reviewed-on: https://webrtc-review.googlesource.com/c/123902
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26810}
diff --git a/modules/video_coding/codecs/test/videocodec_test_libvpx.cc b/modules/video_coding/codecs/test/videocodec_test_libvpx.cc
index ae079c6..6692315 100644
--- a/modules/video_coding/codecs/test/videocodec_test_libvpx.cc
+++ b/modules/video_coding/codecs/test/videocodec_test_libvpx.cc
@@ -153,7 +153,7 @@
 
   // Quality should be higher for lower framerates for the same content.
   std::vector<QualityThresholds> quality_thresholds = {
-      {33, 32, 0.89, 0.87}, {33.5, 32, 0.90, 0.86}, {33.5, 31.5, 0.90, 0.85}};
+      {33, 32, 0.88, 0.86}, {33.5, 32, 0.90, 0.86}, {33.5, 31.5, 0.90, 0.85}};
 
   fixture->RunTest(rate_profiles, &rc_thresholds, &quality_thresholds, nullptr);
 }