Ignore invalid optional constraints with invalid aspect ratio.

content/renderer/media/media_stream_video_source.cc

Index: content/renderer/media/media_stream_video_source.cc
diff --git a/content/renderer/media/media_stream_video_source.cc b/content/renderer/media/media_stream_video_source.cc
index c95f429b466454e534878c674a5cc31578e43c46..759e6213960d07c8daf12bacb0245514a773d069 100644
--- a/content/renderer/media/media_stream_video_source.cc
+++ b/content/renderer/media/media_stream_video_source.cc
@@ -106,7 +106,10 @@ void GetDesiredMinAndMaxAspectRatio(
     }
   }
   for (const auto& constraint_set : constraints.advanced()) {
-    if (constraint_set.aspectRatio.hasMax()) {
+    // Advanced constraint sets with max aspect ratio 0 are unsatisfiable and
+    // must be ignored.
+    if (constraint_set.aspectRatio.hasMax() &&
+        constraint_set.aspectRatio.max() > 0) {
       *max_aspect_ratio = constraint_set.aspectRatio.max();
       break;
     }