Increase WebRTC default receive buffer size to 1MB.

The previous default size was 256kB.
The increase reduces packet loss at very high/bursty receive rates.

Bug: chromium:41485050
Change-Id: I2cf24b14e704bfd855701461afd3060ac078df70
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/340340
Auto-Submit: Erik Språng <sprang@webrtc.org>
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41820}
diff --git a/media/base/media_constants.cc b/media/base/media_constants.cc
index 5e295cf..aaae12c 100644
--- a/media/base/media_constants.cc
+++ b/media/base/media_constants.cc
@@ -16,7 +16,7 @@
 
 const int kVideoMtu = 1200;
 const int kVideoRtpSendBufferSize = 262144;
-const int kVideoRtpRecvBufferSize = 262144;
+const int kVideoRtpRecvBufferSize = 1048576;
 
 const float kHighSystemCpuThreshold = 0.85f;
 const float kLowSystemCpuThreshold = 0.65f;