Reduce ProbeController::kDefaultMaxProbingBitrateBps to 10 Mbps.

webrtc/modules/congestion_controller/probe_controller.cc

Index: webrtc/modules/congestion_controller/probe_controller.cc
diff --git a/webrtc/modules/congestion_controller/probe_controller.cc b/webrtc/modules/congestion_controller/probe_controller.cc
index 5f42cf44fdace8e62ee1ddbfc563f7aefbe8b777..757e2a1626f88bd816f0ad1d7f353234abe32227 100644
--- a/webrtc/modules/congestion_controller/probe_controller.cc
+++ b/webrtc/modules/congestion_controller/probe_controller.cc
@@ -35,7 +35,7 @@ constexpr int kExponentialProbingDisabled = 0;
 
 // Default probing bitrate limit. Applied only when the application didn't
 // specify max bitrate.
-constexpr int kDefaultMaxProbingBitrateBps = 100000000;
+constexpr int kDefaultMaxProbingBitrateBps = 5000000;
 
 // This is a limit on how often probing can be done when there is a BW
 // drop detected in ALR.