Make the remote_bitrate_estimator build target private

Bug: webrtc:9808
Change-Id: I6f0c23841bbdc2999505b89888cf261c31536408
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/194330
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32703}
diff --git a/modules/remote_bitrate_estimator/BUILD.gn b/modules/remote_bitrate_estimator/BUILD.gn
index 3f65325..81aa1ef 100644
--- a/modules/remote_bitrate_estimator/BUILD.gn
+++ b/modules/remote_bitrate_estimator/BUILD.gn
@@ -9,7 +9,6 @@
 import("../../webrtc.gni")
 
 rtc_library("remote_bitrate_estimator") {
-  visibility = [ "*" ]
   sources = [
     "aimd_rate_control.cc",
     "aimd_rate_control.h",
diff --git a/native-api.md b/native-api.md
index 2ce74c35..a9893c3 100644
--- a/native-api.md
+++ b/native-api.md
@@ -21,7 +21,6 @@
 `modules/audio_processing/include`         | No
 `modules/congestion_controller/include`    | No
 `modules/include`                          | No
-`modules/remote_bitrate_estimator/include` | No
 `modules/rtp_rtcp/include`                 | No
 `modules/rtp_rtcp/source`                  | No
 `modules/utility/include`                  | No