Revert of Replace interface VideoCapturerInput with VideoSinkInterface.

webrtc/call/bitrate_estimator_tests.cc

Index: webrtc/call/bitrate_estimator_tests.cc
diff --git a/webrtc/call/bitrate_estimator_tests.cc b/webrtc/call/bitrate_estimator_tests.cc
index 2896c67f37d0dad443f05918c68b0770b8f111e0..b8a148c79aba33ab63dff07bf892f2427f728964 100644
--- a/webrtc/call/bitrate_estimator_tests.cc
+++ b/webrtc/call/bitrate_estimator_tests.cc
@@ -177,10 +177,9 @@
           test_->video_encoder_config_.Copy());
       RTC_DCHECK_EQ(1u, test_->video_encoder_config_.streams.size());
       frame_generator_capturer_.reset(test::FrameGeneratorCapturer::Create(
-          test_->video_encoder_config_.streams[0].width,
+          send_stream_->Input(), test_->video_encoder_config_.streams[0].width,
           test_->video_encoder_config_.streams[0].height, 30,
           Clock::GetRealTimeClock()));
-      send_stream_->SetSource(frame_generator_capturer_.get());
       send_stream_->Start();
       frame_generator_capturer_->Start();
 
@@ -217,8 +216,8 @@
 
     ~Stream() {
       EXPECT_FALSE(is_sending_receiving_);
+      frame_generator_capturer_.reset(nullptr);
       test_->sender_call_->DestroyVideoSendStream(send_stream_);
-      frame_generator_capturer_.reset(nullptr);
       send_stream_ = nullptr;
       if (audio_receive_stream_) {
         test_->receiver_call_->DestroyAudioReceiveStream(audio_receive_stream_);