Control combined_audio_video_bwe with config bool.

webrtc/video/bitrate_estimator_tests.cc

Index: webrtc/video/bitrate_estimator_tests.cc
diff --git a/webrtc/video/bitrate_estimator_tests.cc b/webrtc/video/bitrate_estimator_tests.cc
index 872fe448032cf6e9033b7649ec29ed6ad5bb54c3..cb6ef0ebf89620288b992ad88dec5a419f1276ab 100644
--- a/webrtc/video/bitrate_estimator_tests.cc
+++ b/webrtc/video/bitrate_estimator_tests.cc
@@ -210,6 +210,7 @@ class BitrateEstimatorTest : public test::CallTest {
         receive_config.voe_channel_id = 0;
         receive_config.rtp.extensions.push_back(
             RtpExtension(RtpExtension::kAbsSendTime, kASTExtensionId));
+        receive_config.combined_audio_video_bwe = true;
         audio_receive_stream_ = test_->receiver_call_->CreateAudioReceiveStream(
             receive_config);
       } else {