diff --git a/test/BUILD.gn b/test/BUILD.gn
index 254b165..77306b9 100644
--- a/test/BUILD.gn
+++ b/test/BUILD.gn
@@ -41,8 +41,6 @@
   sources = [
     "fake_texture_frame.cc",
     "fake_texture_frame.h",
-    "frame_change_extractor.cc",
-    "frame_change_extractor.h",
     "frame_generator.cc",
     "frame_generator.h",
     "frame_generator_capturer.cc",
diff --git a/test/frame_change_extractor.cc b/test/frame_change_extractor.cc
deleted file mode 100644
index 3a51963..0000000
--- a/test/frame_change_extractor.cc
+++ /dev/null
@@ -1,158 +0,0 @@
-/*
- *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "test/frame_change_extractor.h"
-
-#include <algorithm>
-
-#include "api/video/i420_buffer.h"
-#include "rtc_base/checks.h"
-
-namespace webrtc {
-
-FrameChangeExtractor::FrameChangeExtractor() = default;
-FrameChangeExtractor::~FrameChangeExtractor() = default;
-
-void FrameChangeExtractor::SetSource(
-    rtc::VideoSourceInterface<VideoFrame>* video_source) {
-  rtc::CritScope lock(&source_crit_);
-
-  rtc::VideoSourceInterface<VideoFrame>* old_source = nullptr;
-  old_source = source_;
-  source_ = video_source;
-  if (old_source != video_source && old_source != nullptr) {
-    old_source->RemoveSink(this);
-  }
-  if (video_source) {
-    source_->AddOrUpdateSink(this, rtc::VideoSinkWants());
-  }
-}
-
-void FrameChangeExtractor::OnFrame(const VideoFrame& frame) {
-  // Currently only supports I420 buffers.
-  RTC_CHECK(frame.video_frame_buffer()->type() ==
-            VideoFrameBuffer::Type::kI420);
-
-  rtc::CritScope lock(&sink_crit_);
-
-  if (!sink_)
-    return;
-
-  webrtc::I420BufferInterface* current_buffer =
-      frame.video_frame_buffer()->ToI420();
-  int min_row, min_col, max_row, max_col;
-  if (!last_frame_buffer_ ||
-      current_buffer->width() != last_frame_buffer_->width() ||
-      current_buffer->height() != last_frame_buffer_->height()) {
-    // New resolution - fully new picture.
-    min_row = min_col = 0;
-    max_row = current_buffer->height() - 1;
-    max_col = current_buffer->width() - 1;
-  } else {
-    min_row = frame.width();
-    min_col = frame.height();
-    max_row = 0;
-    max_col = 0;
-    // Detect changed rect.
-    for (int row = 0; row < frame.height(); ++row) {
-      for (int col = 0; col < frame.width(); ++col) {
-        int uv_row = row / 2;
-        int uv_col = col / 2;
-        if (current_buffer
-                    ->DataU()[uv_row * current_buffer->StrideU() + uv_col] !=
-                last_frame_buffer_
-                    ->DataU()[uv_row * last_frame_buffer_->StrideU() +
-                              uv_col] ||
-            current_buffer
-                    ->DataV()[uv_row * current_buffer->StrideV() + uv_col] !=
-                last_frame_buffer_
-                    ->DataV()[uv_row * last_frame_buffer_->StrideV() +
-                              uv_col] ||
-            current_buffer->DataY()[row * current_buffer->StrideY() + col] !=
-                last_frame_buffer_
-                    ->DataY()[row * last_frame_buffer_->StrideY() + col]) {
-          min_row = std::min(min_row, row);
-          max_row = std::max(max_row, row);
-          min_col = std::min(min_col, col);
-          max_col = std::max(max_col, col);
-        }
-      }
-    }
-  }
-  if (max_row < min_row || max_col < min_col) {
-    min_col = min_row = 0;
-    max_col = max_row = -1;
-  }
-  // Expand changed rect to accommodate subsampled UV plane.
-  if (min_row % 2)
-    --min_row;
-  if (min_col % 2)
-    --min_row;
-  if (max_row < frame.width() && max_row % 2 == 0)
-    ++max_row;
-  if (max_col < frame.height() && max_col % 2 == 0)
-    ++max_col;
-  VideoFrame::PartialFrameDescription part_desc;
-  part_desc.offset_x = min_col;
-  part_desc.offset_y = min_row;
-  int changed_width = max_col - min_col + 1;
-  int changed_height = max_row - min_row + 1;
-  last_frame_buffer_ = current_buffer;
-  VideoFrame copy = frame;
-  if (changed_width > 0 && changed_height > 0) {
-    rtc::scoped_refptr<I420Buffer> changed_buffer =
-        I420Buffer::Create(changed_width, changed_height);
-    changed_buffer->CropAndScaleFrom(*current_buffer, part_desc.offset_x,
-                                     part_desc.offset_y, changed_width,
-                                     changed_height);
-    copy.set_video_frame_buffer(changed_buffer);
-  } else {
-    copy.set_video_frame_buffer(nullptr);
-  }
-  if (changed_width < frame.width() || changed_height < frame.height()) {
-    copy.set_partial_frame_description(part_desc);
-  }
-  copy.set_cache_buffer_for_partial_updates(true);
-  sink_->OnFrame(copy);
-}
-
-void FrameChangeExtractor::AddOrUpdateSink(
-    rtc::VideoSinkInterface<VideoFrame>* sink,
-    const rtc::VideoSinkWants& wants) {
-  RTC_CHECK(wants.partial_frames);
-  {
-    rtc::CritScope lock(&source_crit_);
-    if (source_) {
-      source_->AddOrUpdateSink(this, wants);
-    }
-  }
-  {
-    rtc::CritScope lock(&sink_crit_);
-    // Several sinks are unsupported.
-    RTC_CHECK(sink_ == nullptr || sink_ == sink);
-    sink_ = sink;
-  }
-}
-
-void FrameChangeExtractor::RemoveSink(
-    rtc::VideoSinkInterface<VideoFrame>* sink) {
-  {
-    rtc::CritScope lock(&source_crit_);
-    if (source_) {
-      source_->RemoveSink(this);
-    }
-  }
-  {
-    rtc::CritScope lock(&sink_crit_);
-    sink_ = nullptr;
-  }
-}
-
-}  // namespace webrtc
diff --git a/test/frame_change_extractor.h b/test/frame_change_extractor.h
deleted file mode 100644
index ea24da6..0000000
--- a/test/frame_change_extractor.h
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef TEST_FRAME_CHANGE_EXTRACTOR_H_
-#define TEST_FRAME_CHANGE_EXTRACTOR_H_
-
-#include "api/video/video_frame.h"
-#include "api/video/video_sink_interface.h"
-#include "api/video/video_source_interface.h"
-#include "rtc_base/critical_section.h"
-
-namespace webrtc {
-
-// This class is used to test partial video frame interface.
-// It receives a full frame, detects changed region, and passes forward only
-// the changed part with correct PartialDescription struct set.
-// Currently only works with I420 buffers.
-class FrameChangeExtractor : public rtc::VideoSinkInterface<VideoFrame>,
-                             public rtc::VideoSourceInterface<VideoFrame> {
- public:
-  FrameChangeExtractor();
-  ~FrameChangeExtractor();
-  void SetSource(rtc::VideoSourceInterface<VideoFrame>* video_source);
-
-  // Implements rtc::VideoSinkInterface<VideoFrame>.
-  void OnFrame(const VideoFrame& frame) override;
-
-  // Implements rtc::VideoSourceInterface<VideoFrame>.
-  void AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame>* sink,
-                       const rtc::VideoSinkWants& wants) override;
-  void RemoveSink(rtc::VideoSinkInterface<VideoFrame>* sink) override;
-
- private:
-  rtc::CriticalSection source_crit_;
-  rtc::VideoSourceInterface<VideoFrame>* source_ RTC_GUARDED_BY(source_crit_);
-  rtc::CriticalSection sink_crit_;
-  rtc::VideoSinkInterface<VideoFrame>* sink_ RTC_GUARDED_BY(sink_crit_);
-  rtc::scoped_refptr<webrtc::I420BufferInterface> last_frame_buffer_
-      RTC_GUARDED_BY(sink_crit_);
-};
-
-}  // namespace webrtc
-#endif  // TEST_FRAME_CHANGE_EXTRACTOR_H_