Increase transport feedback frequency to 20 Hz.

BUG=4173

Review URL: https://codereview.webrtc.org/1466023002

Cr-Commit-Position: refs/heads/master@{#10736}
diff --git a/webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy.cc b/webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy.cc
index 28807b4..15ca42d 100644
--- a/webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy.cc
+++ b/webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy.cc
@@ -20,7 +20,7 @@
 namespace webrtc {
 
 // TODO(sprang): Tune these!
-const int RemoteEstimatorProxy::kDefaultProcessIntervalMs = 200;
+const int RemoteEstimatorProxy::kDefaultProcessIntervalMs = 50;
 const int RemoteEstimatorProxy::kBackWindowMs = 500;
 
 RemoteEstimatorProxy::RemoteEstimatorProxy(Clock* clock,