Extracts LinkCapacityEstimator from AimdRateControl.

This prepares for future refactoring of rate controller.

Bug: webrtc:9718
Change-Id: I425c8c547399bda98b4271a0d24a0bb7ee06bc13
Reviewed-on: https://webrtc-review.googlesource.com/c/112420
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25846}
diff --git a/modules/remote_bitrate_estimator/BUILD.gn b/modules/remote_bitrate_estimator/BUILD.gn
index acc7a35..77aba17 100644
--- a/modules/remote_bitrate_estimator/BUILD.gn
+++ b/modules/remote_bitrate_estimator/BUILD.gn
@@ -46,6 +46,7 @@
     "../../api/units:timestamp",
     "../../modules:module_api",
     "../../modules:module_api_public",
+    "../../modules/congestion_controller/goog_cc:link_capacity_estimator",
     "../../modules/rtp_rtcp:rtp_rtcp_format",
     "../../rtc_base:checks",
     "../../rtc_base:rtc_base_approved",