diff --git a/api/test/mock_media_stream_interface.h b/api/test/mock_media_stream_interface.h
index 209962358d..17a30a877e 100644
--- a/api/test/mock_media_stream_interface.h
+++ b/api/test/mock_media_stream_interface.h
@@ -84,52 +84,6 @@ class MockAudioTrack final : public rtc::RefCountedObject<AudioTrackInterface> {
   MockAudioTrack() = default;
 };
 
-class MockMediaStream : public MediaStreamInterface {
- public:
-  MOCK_METHOD(std::string, id, (), (const override));
-  MOCK_METHOD(AudioTrackVector, GetAudioTracks, (), (override));
-  MOCK_METHOD(VideoTrackVector, GetVideoTracks, (), (override));
-  MOCK_METHOD(rtc::scoped_refptr<AudioTrackInterface>,
-              FindAudioTrack,
-              (const std::string& track_id),
-              (override));
-  MOCK_METHOD(rtc::scoped_refptr<VideoTrackInterface>,
-              FindVideoTrack,
-              (const std::string& track_id),
-              (override));
-  MOCK_METHOD(bool,
-              AddTrack,
-              (rtc::scoped_refptr<AudioTrackInterface> track),
-              (override));
-  MOCK_METHOD(bool,
-              AddTrack,
-              (rtc::scoped_refptr<VideoTrackInterface> track),
-              (override));
-  MOCK_METHOD(bool,
-              RemoveTrack,
-              (rtc::scoped_refptr<AudioTrackInterface> track),
-              (override));
-  MOCK_METHOD(bool,
-              RemoveTrack,
-              (rtc::scoped_refptr<VideoTrackInterface> track),
-              (override));
-  // Old AddTrack/RemoveTrack methods - slated for removal
-  MOCK_METHOD(bool, AddTrack, (AudioTrackInterface * track), (override));
-  MOCK_METHOD(bool, AddTrack, (VideoTrackInterface * track), (override));
-  MOCK_METHOD(bool, RemoveTrack, (AudioTrackInterface * track), (override));
-  MOCK_METHOD(bool, RemoveTrack, (VideoTrackInterface * track), (override));
-  MOCK_METHOD(void,
-              RegisterObserver,
-              (ObserverInterface * observer),
-              (override));
-  MOCK_METHOD(void,
-              UnregisterObserver,
-              (ObserverInterface * observer),
-              (override));
-};
-
-static_assert(!std::is_abstract_v<rtc::RefCountedObject<MockMediaStream>>, "");
-
 }  // namespace webrtc
 
 #endif  // API_TEST_MOCK_MEDIA_STREAM_INTERFACE_H_